I'm really liking the new Avalon (Windows Presentation Foundation) layer in Windows Vista and WinFX. I've been working with it for the last six months and have developed a couple talks that I give about the technology. It's going to change the face, no kidding, of Windows development over the next five years. Imagine a tool that lets you easily mix 2D, 3D, Rich Text, Video, Multimedia and more into a single API.
I tell people about how cool its going to be, but it's not easy to visualize. If you don't have the Avalon beta bits on your computer you can't run any of the demos. So a lot of people think it just going to be eye candy and some transparent windows. So watch a video and decide for yourself.
iBloks is a new game/toy application built with Avalon. You can animate pictures, mix sound and more. Watch the video here.