My favorite games on Xbox are either baseball or racing. I've been playing MLB 2K7 since it came out, but I'm ready for something new. Luckily Forza Motorsport 2 comes out tomorrow and it should be a great one!
So far I've been playing the demo and these are my best lap times:
0:52.804 - #4 Corvette C6.R
1:01.645 - Ferrari F430