We've added screenshots from a couple of Windows Presentation Foundation (WPF) applications that we designed a few months ago. WPF is the vector-based UI that Vista uses. It's also available on Windows XP once you install .Net 3.5, and on the web via a plugin called Siverlight.
Silverlight is essentially, a Flash competitor, although it still lacks some of the polish of the more mature Flash environment.
Here's a video of a demo developed as a proof-of-concept of the 3D and animation capabilities of WPF.