Lego robot, Convert 2D drawing to 3DGhost Stories, Hitler's bomb, Bendable concrete, AirScooter, Email monitoring, Stealth ship, Monkey walking on 2 legs, Invisibility cloak, Self cleaning glass, 25 GB paper disk, 3D demo <100kB, OS GUI's, 1 PC with 37 OS's, Perpetuum mobiles, etc.
Upcoming movies, Movie database IMDB, MovieList,
ToTheGame reviews, Caiman reviews, GameHippo reviews, Demo's, PacMan, CurveBall, Asteroids, Tailgunner, etc.
Online tools
Email, Inbox, BugMeNot, Upload sites, Spell Checker, Translation, Archived websitesSafe surfing, etc.
JavaWorld tips, IBM DeveloperWorks, Search Sun, JDC TechTips, Thinking In Java, Thinking In Patterns, etc.
Live CD (OS boots from CD , really cool!) , Small Live CD (50MB), etc.
Startrek Official site, LowerDecks (Scifi general), ThePulsar (Scifi general), Ex-Astris, StarTrek Wiki
Edit Gif, MovieWallpapers, Animated Gif's, IconArchive, etc.

Movie Websites  
Information about upcoming movies
Information about released movies
Large amount of movie trailers
Movie news

Game Websites
A lot of free PC games in all kind of flavors
Over 1000 freeware PC games to download

Online games, Flash etc
Information about upcoming games on PC, XBox, PS2, GameCube

Information about released games
Demos and small reviews of games
Flip 2 jewels so that you get 3 of the same kind in a line

Nice 3D-pong Flash game

The original Pacman game

old Asteroids game, shoot the asteroids and the UFO's

Lunar Command
Lunar Command, protect your moon bases against attacks
Java Applet Game
Tron game in Macromedia Shockwave

Games in Macromedia Shockwave and Java Applets, login is free and you only have to give a name and password (used to keep highscores)

Here are the rules: Pretend to be a dictator or television sitcom character. I'll try to guess who you are by asking simple yes/no questions.
HSX is just like the real stock market, only way more fun!
Buy shares of your favorite actors and their new movies. Watch their values rise or fall based on their success. Prices soar with a blockbuster opening at the box office and plummet with a bomb no one went to see.

Technical Websites 

Someone asks for your email. You know if you give it, you're gambling with your privacy. On the other hand, you do want at least one message from that person. The answer is to give them a mailinator address. You don't need to sign-up. You just make it up on the spot. Pick or - pick anything you want (up to 15 characters before the @ sign).  Later, come to this site and check that account.

Easiest way I know to send a file with E-mail
Go to the website, enter the E-mail address, browse the file that you want to send and click the send button

You're browsing the web and you click a link to an article on a site (let's say but instead of getting the article you get a screen asking you to login or register. Infuriated at the idea of pointlessly registering for yet another site you turn to your good buddy
Upload sites :
Sites where you can upload data to the Internet, so others can download it.
All free services.

The WayBackMachine
Browse through 30 billion web pages archived from 1996 to a few months ago. To start surfing the Wayback, type in the web address of a site or page where you would like to start, and press enter. Then select from the archived dates available. The resulting pages point to other archived pages at as close a date as possible.

Check the spelling of a piece of text, gives a list of alternatives for each "incorrect" word.

Merriam Online Dictionary - Thesaurus
Online dictionary and thesaurus

English Dictionary
Online dictionary

Online spreadsheet
Simple online spreadsheet, you can insert text, formulas with functions like sin, cos, log, conditions etc
Able to save your data online

Webnote is a tool for taking notes on your computer. It allows you to quickly write something down during a meeting, class, or any other time that you have a web browser available.

Word like online Html editor, only for IE, NOT for Netscape, Mozilla, Opera etc
Online html editor where you can format the text on the fly like in Word
This tool works only in IE
Online Html editor
Online html editor with little wizards for all important tags like tables, images, links, etc

Online PDF and Word viewer
Online PDF viewer, no acrobat needed

J-Painter is an image editor which allows to draw within a browser. The resulting image can be uploaded to the server. The uploaded image in turn can be saved to a disk file or a database at the server, or sent by e-mail.
Modify an excisting animated gif to your needs with this online tool
Rot13 encryption
The simplest of all encryptions, no password

Anonymous proxy
Through Proxify, you can use websites but they cannot uniquely identify or track you. Unlike other proxies, there is no software to install or complicated instructions to follow. Proxify hides your IP address and the encrypted connection prevents monitoring of your network traffic. Once using Proxify, you can surf normally and forget that it is there, protecting you.
Other proxies

Free Webhosts
Search for Free Website Providers that meet your specific requirements for size, scripting, databases, etc

Yahoo online briefcase (storage)
Yahoo! Briefcase is a tool that allows you to store files online and then access them from anywhere. Think of it as an extra hard drive that you can use from any computer connected to the Internet. We give you 30MB worth of space for free, to get you started. That's room for plenty of files. There's no catch -- you just have to be a registered Yahoo! member.

File extension info
FILExt is a detailed database of file extensions and programs that use them. FILExt is not a general support site. A search on the database here might very well result in multiple possibilities; it will be up to you to determine which, if any, of these are the program/format you require information about. To help, many of the links on this site will open a new browser window so you have constant reference to the FILExt data.

Word 97/2000 (as well as Word XP in default mode) password protection uses strong enough encryption algorithm, but because of U.S. crypto export regulations key length is only 40 bits. So, you need to test only 240 keys (not passwords) to decrypt your file with guarantee. GuaWord does it, and key testing will take about 20 days only on the same Pentium III/800 PC. Within this time (and in average within the half of this time) ANY file, encrypted with ANY password (no matter what length of the password is or what language or symbols used, etc) can be decrypted.

Show my IP
Here is where you easily find your unique Internet Protocol address and associated host (DNS or Domain Name System) name; Internet Service Provider (ISP) name; Organization that owns your IP Address; browser type, version and exposed headers; geographic location (country, region, city) of your computer or wireless device; location, address and name of any proxy server you connect through; local weather and news resources; date and time stamps from our server, a time server, and your local computer; CPU type and screen information about your computer (or device)

Measure your internet connection speed, to some standard sites

The W3C Markup Validation Service
The W3C Markup Validation Service is a free service that checks documents like HTML and XHTML for conformance to W3C Recommendations and other standards.
You can enter an website-link or upload a file, very simple

Try your hacking skills on these sites, it's legal to hack them !

Note: It's not legal to hack my site
Online translations from English to Chinese, Dutch, French, German, Greek, Italian, Japanese, Korean, Portuguese, Russian, Spanisch and visa versa

Online translation + able to translate websites

Online Math Tools
This page contains prepared links to more than sixty online tools for every day purposes, and some hints where you find more. Some selected links which will be used very often (on account of their generality) are designed as buttons. Below these you find a list of more specialized tools. Each tool is started in its own browser window, so that it may be used simultaneously with other pages of maths online.
Modify an excisting jpg or animated gif to your needs with this online tool
Annoyed with some windows 'functionality' ?
this site has probably an answer

News about everything Java related
News about everything Java related
Large search site if you have problems
Technical tips
Java programs
Online html version of  Thinking in Java
Online html version of Thinking in Patterns
Downloadable version of Thinking in Java
Downloadable version of Thinking in Patterns
Online html Java tutorial
Online html Book: Advanced Programming for the Java 2 Platform
Java Tips
Javascript JavaScript, this isn't Java
Comparisons : LinuxPlanet, ExtremeTech
News : All4Linux, LinuxWaves
Info :
Frozentech, Knoppix on the fly, LinuxNewbie, LinuxAbout, LinuxQuestions, LinuxGuide, LiveCD's list
Windows software on Linux: Windows software and games on Linux, Run Windows software on Linux with Wine
Puppy Linux
Small (~90 MB) but very powerfull Live CD Linux.
Live CD means that if you start or restart your computer with this CD than it will run the Linux OS in RAM, without changing your computer / harddisk.

PET's are programs that can be installed in Puppy Linux, simply click them and choose "Install" :
Wine (for running Windows executables), TestDisk (reparing harddsik)
DamnSmallLinux Live CD, 50 MB, good for older hardware
Has GUI,
Internet access, Siag (can read MsExcel files), Firefox (Webbrowser), FAT read/write, NTFS read.
UltimateBootCD Live CD, run floppy-based diagnostic tools from CDROM drives
Consolidate as many diagnostic tools as possible into one bootable CD
Slax Kill Bill
Live CD, can read MsWord docs, Spreadsheet program for reading MsExcel files, Internet access with Konqueror, automatically mounts harddrives (not NTFS) and can run some Windows programs with the Wine emulator, size ~200 MB

Startrek Websites 
The official site
Website with reviews information, ratings, etc
Website with info about different scifi series
Reviews, Images, Stories, etc

Memory Alpha is a collaborative project to create the most definitive, accurate, and accessible encyclopedia and reference for everything related to Star Trek. The database is organized in a WikiWiki structure, which allows an incredible level of interconnectedness and expansion. We started in November 2003, and the database currently includes 3867 articles.

Picture Websites 
Modify an excisting animated gif to your needs with this online tool
Large collection of movie pictures
Large collection of movie pictures
Collection of Scifi pictures, it's a German site, click the following button on the site:
Small collection of Startrek pictures
Small collection of Startrek pictures
Collection of Startrek and Starwars pictures
Collection of Starwars pictures

Collection of Animated gifs

Collection of Animated gifs

Collection of Animated gifs
Collection of Animated gifs
Collection of Icons and Animated gifs
Large collection of Icons in zipfiles, very good
Collection of Icons