Raspberry Pi XBMC
The Raspberry Pi is a creditcard sized micro computer that runs various Linux operating system flavors. Its amazingly cheap prize (35$), the small size and its little power comsumption render it a great gadget for many purposes. With very little effort the Raspberry can be converetd into a mediacenter for watching HD movies or stream movies from Youtube. The setup is quite easy and just involves a few steps. You can comfortably control the device with the App Yatse on your Android phone. Try it! Its great!