My setup probably isn't as energy efficient, but I am proud of the fact that I can control my 'dumb' TV with my phone: http://csmatt.com/notes/?p=32 (also contains comments on different media center applications available.) There's also this post http://csmatt.com/notes/?p=62 about hacking the LG Wireless Media Kit (AN-WL100W) to use the same HTPC to feed a TV in the bedroom.