Here is the YouTube trailer for the movie Ice Age 4 playing in XBMC.
XBMC provides access to YouTube through a software add-on. The media-centre software supports a range of plug-ins, which allow it to play a wide range of video and audio from a variety of sources on- and offline.
Note, both this shot and the previous image are photos of the TV running XBMC. In reality the image quality on the Pi is sharper and more vibrant than the pictures may suggest.