I was just browsing the Open Source selection of the IBM Developer Works and stumbled upon an Arduino based tutorial, figured I'd share it!
I did a few searched and haven't found it posted here so if it is, well here's another! It's broken up into 3 selections, and were posted a couple years back.
I've read this and it's quite good. A chick at NYC Resistor showed it to me.
I am making a tankbot game by mounting a laser tag gun on the back of tracked bot. You would make 2 remote controled tankbots, a 4'x8' course and then you can fight 'em. I'm currently building the second tankbot and having second thoughts that the game will suck.