Edit - Updated to make this thread the catch-all for GT5.
The Gran Turismo 5 demo will be available this Thursday, Dec. 17, on PSN. The demo will include two variations of the Nissan 370Z and the road course at Indianapolis Motor Speedway.
To put a twist on things, the person who has the best combined time (between both variations of the Z car) will win a free VIP all access pass to the Indy 500 next year.
I'll definitely give it a try, but I already know I won't have a chance at getting the trip. Hopefully they will have real time leaderboards so we can at least see the top times as they're set.