Jabbas world grand prix?
 

free small easy and really realistic

http://www.liveforspeed.net

the demo is all thats out now but a 25% version (for people who paid) will be out in 2 weeks

the game is really easy to play online but as a true sim the cars are hard to drive

there are Fwd hot hatch rwd 4cyl and a rwd turbo 4cyl

try it out i gauruntee a great game

I played LFS for a while.. very nice! But my PC is more and more unstable and I can't play no more :-/