Nothing. I pay cash for mine.
Never had a car payment, and never will. I've also never owned a new vehicle (or even moderately new). I'm not knocking anyone who does get a new car, it's just to me a car doesn't matter. With my wife and kids to support and me still being in school (last semester though, and I think I already have a job lined up! ) we are broke as it is. Driving around a beater is better for my family financially, and so long as whatever I'm driving plays mp3's so I can listen to the Economist audio edition and my sci fi audio books (right now I'm working through Peter F. Hamilton's Judas Unchained) then I'm a happy camper.