I don't have much more than that to say.  Other than the fact that I've had my eye on this one.  I'm not a big racing fan but this looks great.  It's a racing game on four wheelers.  Motorstorm meets SSX.  Do tricks in order to get some boost, lot of custimization for your bike too.  The graphics look beautiful, with a impressive draw distance.  

http://www.gametrailers.com/player/38281.aspx
Pure

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Like Zoy said Baja is another one to look out for.  It has a simulationmode, four hour race with unique terrain.  This mode supports onlineand if you leave to take a piss or something you can let the AI drivefor you.  Now that's innovative.  Reminds me of Dakar.  It's not thekind of mode you play all the time.  On a rainy Sunday, this could beawesome.  Almost worth getting a wheel for it.  I wonder if the G25would work?  That would be pretty sweet.   

http://www.gametrailers.com/player/37868.aspx
Baja