Check yourself before you wreck yourself (or before you wreck your bank account with a new car loan anyway.)
Basically, it's $3,000 off a new car if you've been driving an 10 year old or older P.O.S. for the last year or so and you meet certain income restrictions. I don't qualify for a number of reasons, but I'm sure someone who reads this does or at least knows someone who does. Here's the link:
http://www.tceq.state.tx.us/implementation/air/mobilesource/vim/driveclean.html
Now go out and stimulate that ecom-muh-nee!
Go buy a Nissan Versa - cheapest car in the U.S., good gas milage, and Nissan is pretty reliable I think. Brand new car is like $9,000ish (prolly $10,000 after bullshit fees). That's $7,000 after rebate for a brand new 2009 car.