TVTonic for MCE - IPTV, Podcast, Video feeds and more!
TVTonic has to be one of the more useful plug-ins for the Windows Media Center that I have used. Overall this works awesome for me to subscribe to all my techie video casts via RSS and watch them on my TV. I have a problem at times with the scaling of my plasma with this plug-in but relaunching the app seems to fix it.
I would say TVTonic is a must for anyone that has a mediacenter (you can stream HDTV) or anyone that watches a lot of media online (can also be used in IE)
THe site can be found here:
http://www.tvtonic.com/
Try it - you will be hooked!