You guys really have to check this game out. Its tons of fun and its very easy to pick up for anyone. Its from the people who made the Trackmania series and its sponsored and made for eSports, there's also a lot of Nvidia sponsoring with it.
http://www.trackmania-lejeu.com/sunr.../downloads.php
The page is in french but its the latest update on top, just click on: Téléchargez le jeu (265 mo). And the game will start downloading, as that implies it is a 265MB download.
Check out:
http://nations.tm-exchange.com/main.aspx For a lot of custom tracks people have made.
Here's some screenshots to get an idea of the game:
http://www.trackmanianations.com/ima...hots/Tmn01.jpg
http://www.trackmanianations.com/ima...hots/Tmn02.jpg
http://www.trackmanianations.com/ima...hots/Tmn03.jpg
http://www.trackmanianations.com/ima...hots/Tmn04.jpg
http://www.trackmanianations.com/ima...hots/Tmn05.jpg
http://www.trackmanianations.com/ima...hots/Tmn06.jpg
http://www.trackmanianations.com/ima...hots/Tmn07.jpg
http://www.trackmanianations.com/ima...hots/Tmn08.jpg
http://www.trackmanianations.com/ima...hots/Tmn09.jpg
http://www.trackmanianations.com/ima...hots/Tmn10.jpg
Also, the game is heavily sponsored by Nvidia, but it will run on ATi graphics cards to very well. There's just Nvidia banners in the game here and there and nothing that's going to annoy you. The games looks just as good as the screenshots and runs very well on my system.