Microsoft Expression - Interface Development for Windows Applications
By now I'm sure you've heard of 'Avalon', the new graphics subsystem for Windows Vista - and possibly even seen the cool demo's showcasing this new technology.
But I'm sure you were wondering...."How can I create those cool apps??"
Well, here's one way - the new Microsoft Expression Studio:
http://www.microsoft.com/products/expression/en/default.aspx