Activision has released a playable demo of Neversoft's Tony Hawk's Project 8 onto Xbox Live Marketplace.
Weighing in at 340MB, the demo takes place in the Concrete Park section of the game and gives you the chance to try out the new "Nail the Trick" thingy, which apparently involves using the analogue sticks in new and interesting ways.
There's also a "Filmer" goal, where you have to perform tricks for a cameraman, and "Spot Challenges", which involve performing certain tricks when you come across them.
Tony Hawk's Project 8 is due out on Xbox 360 in mid-November, with PS2, Xbox and PSP versions also due out around then and a PlayStation 3 version also in development.