The Demo for GRID is now available for free on the PlayStation Network.
On top of that, there is a challenge built in when using the time trial function, WITH a main prize: a new BMW 3-series. After you set a time, you can get a code, which can be filled in on the GRID website. You cans ee how you are doing, and what the time of the first is. The top 5 drivers will be invited to London on the release day to challenge eachother. The winner goes home with a brand new BMW 3-series. (Challenge is for EU citizens only...)
UPDATE: The track for the Euro Challenge is the Jarama GP circuit. There is also a challenge for the USA, here you can win a eBay liveried Ford Mustang GT-R. Track for the US challenge is San Fransisco eBay Muscle Car Track.