I've always had a soft spot for the epic TrackMania racing games - and this one seems to be the most epic one yet!
YT: Trackmania offers you the ultimate arcade racing universe where everything is about reaching the perfect racing time. Test your skills in over 200 tracks, experience immediate fun by challenging your friends at home (offline splitscreen) or online. The competition lasts forever: design and share your own tracks with other players in the Trackbuilder!
More info on http://www.trackmania.com