Media Center Vista
I've come across one of the best MCE plugins, and it's available for Vista. WebGuide 4 allows you to connect to your Media Center PC over the net using a browser. The application gives you a rendering of the guide and you can setup recordings, series links or remove recordings.
There are other options as well, these allow downloading of your recorded media etc.
Pop along and have a look for yourself if you use Media Center, well worth a go.
Possibly Related : Vista X64 and Media Center Media Center Extender Media Center WideScreen Media Center Extender (part 2)
