Here is a rather cool looking home screen replacement user interface for android phones. I am sure we will start seeing things like this specifically developed for tablets and taking advantage of the space.

http://forum.xda-developers.com/showthread.php?t=817443

I have noticed that on all the videos I have seen of the Tab the wallpaper on each of the five screens. I hope you can actually have unique wallpapers on each screen otherwise that would be rather boring.

Also is it possible to hack it to have more than 5 screens? I thought android supported more than five (and HTC sense has 7).