I have been considering ways to add to my Vista Media Center experience and one of the things I'm interested in doing is adding YouTube and other online media sources so I don't have to hop into a browser to see them. I haven't tried it yet, but I came across Yougle Vista - a plugin for Windows Vista Media Center to integrate YouTube, Flickr, Apple Trailers, and several other online media sources right into the interface. Might have to try that out.