The Official LEGO Mindstorms Page:

• LEGO Mindstorms

Programming Languages/Additional Sensors:

• Not Quite C
• RCX Control Center
• Mike Gasperi's Homebrew Sensors
• TFM's Home Page deals with options you can make for your RCX
• Bert van Dam's Lego Robots and Artificial Intelligence
• Lego Mindstorms Internals

Personal Homepages:

• Calum's homepage
• Chris Magno's homepage
• Jin Sato's homepage
• Hitoshi Hirota's homepage
• Ben's LEGO Creations
• James Mathis' page of LEGO® Creations
• Gavin's page on how to build a walking robot

Clubs/Organizations/Competitions:

• Annual Toronto Lego Robotics Event
• First Annual Guelph LEGO Robotics Contest
• Robot Arena

Pages of Links dealing with Mindstorms:

• Everything LEGO Unofficial Collection of Links
• Lego Robots Links
• Lego Mindstorms Internals

Pneumatic Pages:

• Original Lego Designs by Jennifer Clark
• CSSOH'S LEGO Pneumatics Page