[JohnC]

It's because you've got one motor mounted backwards, and the motors actually have a preferential direction. If you have encoders on your drive shafts, we have some code we're working on right now that will make it drive straight.

I'm sure someone else will have some code up before I will, but if you send me an email to remind me I'll put it up by monday.

P.S. I'm literally working on it RIGHT now ... final touches ... (which means nothing, of course)