Here at ONEsite we've done a lot of work wrapping social interaction around media such as streaming video.  We've done everything from streaming video from webcams at kiosks in musuems to having OnAir DJs being able to stream audio/video while chatting with their listeners.

I really believe that as television and the Internet combine we'll see some really interesting mashups of reality programming and social interaction.  The consumers of media will increasingly be able to participate in the production process and alter the contents of the media itself.