This is the ratb0t, he has a nervous behavior and it remainds me a rat.. :]
I´m using an Arduino Diecimila to control the steering servo and the traction motor.
The XBee module recieves data from another Arduino, this one has a wii nunchuck controller attached.
Next Step: make it autonomous
I like the skitterish start it makes, as the bumpy tire bounces and spins. Kinda hard for it to steer when it's pushing the crossbar part.
Hi! thanx for the words!
He doesn´t steer at all when driving backwards.. but I kinda like it 
That's neat. What on earth was the tractor device originally?
wanna guess? :
No idea. It looks vaguely mouse-like in size and shape of the top side, but it's obviously not that. I really can't figure out what it is.
Come on! 
here you can read the full story, check the update section
Well, that's very creative!