The Linksys DMA2200 Media Center Extender is another device that streams music, videos and photos from your PC to your TV
It is designed to be a small device that sits under your TV or Hi-Fi enabling you to use Windows Media Centre's interface on your TV.
This isn't like the Acer Revo which is posted elsewhere as it is not a computer itself, you will need to have your PC running somewhere for this to work.
Basically the idea is that you have your PC running in your bedroom or study choc full of films and music and you can simply turn on your tele in the living room and access all of that content withot wires running all around your house
In addition this has an upscaling DVD player built it too
£235 when released so a very good price. Full review here: http://www.pcw.co.uk/personal-computer-world/hardware/2208886/review-linksys-dma2200