Howtogeek posted a guide about adding extra streaming TV services to Windows 7 Media Center

Windows 7 Media Center is a great tool for watching live and streaming TV, but what if the included Internet TV isn?t enough? Today we look at the TunnerFree MCE plugin to add more streaming choices.

TunerFree MCE
Note: We are installing this in the US and UK users will have different available channels.
Make sure you?re closed out of Media Center and download and install TunerFree MCE plug in (link below). You can install it using the Typical Setup Type.

  Add Extra Streaming Television Services to Windows 7 Media Center