Yes- I have been screwing around with Vista for the past two days; but more gizmos abound!
1st new 'got to have' addon is TVTonic; This is basically a video podcast agregator that can collect any video podcast that supports RSS enclosures. It has severl hundred podcasts in its library (only fav I didn't see was MoBuzzTV!) and it downloads in the background and allows me to play them from an embedded program in Media Center. (I guess this kills the need for a video cable for my iPod!)
2nd new addon is something I am stil testing is a Media Center Remote Record option. It reuqires an install on the MCE system, but then I can login to a MSN TV guide and search/schedule any show for recording (via a passport/live account).