2:Robotics, drone aircraft, a lot of different things, avid follower of ardupilot and the guys @ diydrones.
3: I reverse engineered the wii motion plus and have a few demos of that that are posted around, built a library to control the isobot robot, and have an awesome working bus notifier that works completely from the ethernet module to check bus position from gville's GPS website. And it can be accessed via txt message to twitter.
Cool stuff & fun projects! I just saw ardupilot for the first time the other day - looks like a great project for me and the boys 