If you're looking to sample Criterion's latest racer, Need for Speed: Most Wanted has a demo available on Xbox Live and PlayStation Network today. The demo tosses players the keys to four different vehicles: the Aston Martin V12 Vantage, Porsche 911 Carrera S, Audi R8 GT Spyder and Ford Focus RS500.During the Need for Speed: Most Wanted demo, players can earn up to 50,000 Speed Points, the in-game currency. These 50,000 Speed Points can then be applied to the single-player game proper.