I totally forgot!! Trackmania Nations Forever! It's free, looks great, good multiplayer, easy to learn/hard to master! Plus you get to design the whole look of your car (default is whatever country you say you are from when you sign on) but I switched to a Holland motif in honor of my favorite Indy driver. It even has a 3-D option. Not that high tech grabage mind you, but old school 3-D for those of us who grew up in the 80s!
You will need to make or buy some of those blue/red 3-D glasses
http://trackmaniaforever.com/