Out of the blue, a demo for the revived Turok franchise just popped on to Xbox Live. If you are a gold member (not living in Korea or Japan) you can download it and test your FPS skills against dinosaurs. I spent some time with Turok in the past and the game does not have to be played with a shoot-first-ask-questions later strategy. Other strategies include luring enraged dinosaurs into an enemy base and stealth tactics for instant kills.
Update: I logged on with my US account and I didn't see it. However, if you have a gold account in Asia (*most of asia) or Europe you should be able to get access to this. The Turok demo is up on my Singaporean Xbox Live account.