Josh says “Windows Presentation Foundation (aka WPF, aka Avalon) is the best thing to happen to Tablet PC's.”
Josh, I couldn't have said that better... well done! (We're trying hard to live up to your expectations, anyway. :-)
This reminds me -- at a recent talk, I happened to mention (to a group of Tablet PC developers) how ScrollViewer could be re-styled to align the scrollbar on the left, for left-handed users. The response was quite enthusiastic! Here's the XAML...
http://www.windojitsu.com/blog/leftiescrollviewer.html