Stepper-driven tank platform for remotely operated vehicle

First: Some history.

I found this cheap wifi pan-tilt camera on ebay. It's a Foscam knockoff, and I bought it for about AUD$60 delivered. I strapped it to the top of a cheap RC car chassis, compiled an application for the camera, wrote it into the ROM, banged out some python, stuck on an arduino and had a bit of fun:

http://www.youtube.com/watch?v=UcSHahwmB0A
http://www.youtube.com/watch?v=1wuCoz7Y2VY
http://www.youtube.com/watch?v=Qv-Fi1xO2k0
http://www.youtube.com/watch?v=6vcNZrvgPe0