I'm playing the Xbox 360 demo of Peter Jackson's King Kong: The Official Game of the Movie (Xbox 360 demo).
The demo is slick, and absolutely amazing in high def on a projection screen. This is the first game that, for me, is seriously enhanced by the big-screen treatment.
There's a quirk in the "V-REX" level -- when you get into the pool of water, wait there until the T-Rex moves on, and one of your party makes a comment to you. That'll end the demo. If you exit the pool before the comment is made, you'll wander around waiting for something to happen, but not able to move on.
Or maybe that's just me.