Trackmania Nations Forever
I dont know if any of you have heard about this game, but you should give it a try.
(Its absolutely free of charge)
Trackmania Nations is a stadium-racing game with good graphics, very cool tracks (the players build them mostly themselves) and its online with a international, national and country-between-country ranking system.
Check it out at: http://www.trackmania.com
<illegal advertise>
(...and also try my clan's server, named "PanzerWax Forever" under Norway.
I'm known there as [PnzrWx]Banzai )
</illegal advertise> :-)