Long Zheng posted some nice simple Windows Vista screencasts a few days ago.  I have Vista running on a laptop but not on a Tablet PC, so obviously the one that caught my eyes was the one focused on the improvements made for the Tablet.  Definitely worth a watch if you use a Tablet today.  Lots of fun features in there like Pen Flicks (setup box pictured below) and of course it "Pops out like a ninja!"