There seem to be a lot of these being given away this year! As one example, be sure to visit the Microsoft Webcasts group in the Product Pavilion for your chance to win one.
On the flight to Orlando, I got to use one for the first time: The Creative Zen Portable Media Center. The device is quite cool, and the case it comes with is very nice. My wife downloaded a bunch of songs from MSN Music onto it, and also two movies. My only complaints so far: the screen is a bit small (especially for wide-screen content) and there doesn't seem to be a way to shuffle your playlist - just individual albums. But I might be hooked!