What's Different About Vista's GUI?

jcatcw writes "Paul McFedries, author of Windows Vista Unveiled, thinks that an operating system should be thought of as more than just its user interface, but then again that interface should work well for the user. He thinks the Vista interface rates 'pretty darned good.' The Windows Presentation Foundation (WPF) results in positive changes for both developers and users. Developers can do 2-D, 3-D, animation, imaging, video, audio, special effects and text rendering using a single API. The use of vector graphics and offloading work to the GPU result in better animations, improved scaling, transparency, and smooth motion."