My current project is an open robot that others have access to via ssh. The robot has source code and a compiler, so anyone can log in, develop a program compile it, and run it. Many visitors can be editing and compiling different programs, but only one at a time can run.
While developing my project I looked for a Linux robotics community and couldn't find one, so I set one up at http://www.linuxrobots.org. I describe my robot, and I invite others to do the same. I hope to see some sort of community sprout up, but so far I haven't been able to put much time into it.
My robot is described at http://www.linuxrobots.org/wiki/michael_shiloh. You will also find instructions there.
You can also jump right into programming my robot - ssh to robot.linuxrobots.org, username robot, password robot, cd src, and start coding. A webcam at robot.linuxrobots.org will let you see the results of your program
I welcome feedback, comments, and questions