In case anyone is interested, there is currently a series of polls on people's home theater tech on ars technica. I'm surprised to see that in the client applications poll, MediaPortal is only on 1% at the moment (currently Windows Media Center is leading on 19%, XBMC on 18%, MythTV is on 4%, and a some apps I haven't heard of seem quite popular). More about the demographics of ars technica readers maybe?