Nitronic Rush is a free game that is part of the Free Indie Bundle:http://theturtle.editions.free.fr/nanigaming/freeindiebundle/. I haven't had a chance to play most of the games on that list but I know Stealth B****** is also definitely worth checking out, especially at the low low price of free.

The game is a racing game kind of in the same vein as Trackmania where it's really all about hi scores and best times. The driving model is pretty loose as you would kind of expect and very arcady. To get the best times you do have to deal with boost management because if you use too much of it your car explodes. Also you can make your car fly as well which is useful for getting out of some tough spots and also for alternate paths. It's actually a very clever game and from what I've looked up on it, it seems to just be student project which makes me excited to see what else these guys make in the future.

Also it looks and sounds a heck of a lot like Tron and that's not a bad thing.