How to mirror your Mac / Pc or any other device with HDMI output to a TV on another room. This is the way that im doing right now and regarding image and audio quality is just great.
HDMI over Ethernet – http://goo.gl/R6WugO
This technology is not new but works really great. You may use it to play games from your computer in your living room TV on your couch witch might be fun for those that game.