Some of you might know this game already.
It's available for PC, NDS and Wii.

Here are some gameplay videos (made by me)











You can download the free version (Nations Forever) for PC here:
http://www.trackmania.com/index.php?rub=nations

If you like this, get United Forever (the version I use)
It's really cheap.
It has 7 different environments, (Desert, Stadium, Snow...)