Mindstorms

Lego Mindstorms Internals - For Lego supergeeks. A project to reverse-engineer the computer interface in order to make your own software.
http://www.crynwr.com/lego-robotics/

Roligheds Lego Mindstorms - Detailed descriptions, pictures, NQC-programs and animations of inventions - among them a typewriter and slot machine.
http://home14.inet.tele.dk/rolighed

Anders' Mindstorms - Showcases a variety projects including a Yatzymatic, a Pinball machine, and a cooler. Also includes information on programming and sensors.
http://www.norgesgade14.dk/index.php

brickOS - An alternative operating system for the Lego Mindstorms RCX Controller. Includes documentation and downloads.
http://brickos.sourceforge.net/

ClimbBot - Includes video, images and a Java applet to show off this robot that can scale a horizontal rope.
http://www.jumpstation.co.uk/lego/

TinyVM - A firmware replacement for the Lego RCX, with a small Java VM in it.
http://sourceforge.net/projects/tinyvm

Lego Mindstorms Sensor Input - How to make many new homebrew sensors for your RCX with links to other sensor projects.
http://www.extremenxt.com/lego.htm

Engineers of Tomorrow - Team participating in robotics competitions. Highlights learning stuff, provides links to projects, lesson plans, and resources for LEGO Mindstorms and LEGO NXT enthusiasts.
http://homepage.mac.com/keithmjohnson/EOT/

Marcus' Lego Creations - Presents a young fan's successfully created Mindstorm robots, Tornado, the Professor, the Dunkobat, and EMW-module.
http://www.fischer-mellbin.com/Marcus/Lego/lego.html

Remote Control X - A program that allows you to control your Lego Mindstorms invention with a game controller using the infrared transmitter.
http://www.gottcreations.com/software/rmtctrlx/

Advanced Lego Mindstorms Programming in Visual C++ - Provides example source code that shows how to remote-control the Mindstorms robot from within a Visual C++ program using video from the Vision Command camera.
http://www.kyb.tuebingen.mpg.de/bu/people/berger/mindstorms.html

ESG Lego Robotics Seminar - A basic robotics and mechanics class at MIT which centers on Lego.
http://web.mit.edu/esg/proj/ic/www/lego.html