I suggest everybody to go out and grab a copy of Burnout 2. Yes, everybody. Even little Timmy up the back of the class.
Haven't played it on GC yet, but the PS2 version has kept me entertained for an unhealthy amount of time. Can't get enough of sliding into parked cars, to watch my wreck sail through the air, crack into the side of a mountain, land back on the road, and have an oncoming truck attempt to brake, fail, and smash into my smoking disaster.
Mmmmm, destruction.
Oh yeah, the racing is fun too =)