General Official LEGO(R) Mindstorms(RN) Site Lego Users Group Network - robotics section LEGO Mindstorms users Group Japan Legobotics Joe's Mindstorms Gallery (in Japanese)
Programming Artificial Intelligence and Machine Learning RCX and Java Talk to an RCX from a serial port on a Linux box Not Quite C
Technical LEGO Mindstorms Internals Killough's mobile robot platform
We've gone out on an extended lunch break, and aren't sure when we'll be back.
Check here for the group that replaced us: Pittsburgh Robotics Society