What is a good online multiplayer racing game

Here are a couple examples:

Trackmania Nations Forever (holds record for most players online on a single track: 250. There is one server attempting to destroy that record a few days from now: 400 players.)

Project Torque (you start off with one of four base cars and build it up by tuning, etc.)

Upshift Strikeracer (combat-based racing)


I highly recommend Trackmania Nations Forever, though the other two are also high on my favorites lists and recommend that you try them too.
Well actually Upshift Strikeracer is really good. A good Nintendo game is Mario Kart.