This place looks rather new, but looks like it could be some fun, if it would be open to the general public:
http://www.eaglescanyon.com/php/welcome.php

Eagles Canyon Raceway... A few minutes north west of Denton, they say... I have no idea how its set up, I just saw the pictures of the course and them laying the asphalt and thought it might be cool

EDIT:
Well, nevermind

"The Eagles Canyon Raceway Drivers’ Club is a private and exclusive members-only organization. Membership is strictly limited to maximize both safety and the pleasure of driving your own car on a racing circuit."

 

dude this place is awesome, it is actually alot closer to decatur than it is denton. they comleted laying the asphault. i did 3 laps for free (sunday lunch break time) by just talking to the foreman then driving on the track. this place "should" be F1 qualified by 2009.

 

Wish it wasn't closed to peons such as us

 

its just not a public track, looks awesome tho
you should pay the premium for membership and we could all be guests

 

because I am independently wealthy? riiiight.....
It does look like it would be fun to drive on though