The BBC have designed a linux based STB that is based around Linux, and includes support for Freeview, support for home networking, web access, a PVR and IPTV..
One thing to note: The BBC would not manufacture the box, or sell it. The prototype is a demonstration of a series of specifications for other manufacturers to follow..
Sounds like it could be quite nifty...
Trouble is, Ofcom have already notified the BBC that they think this box will stifle commercial competition and they probably will stop it
http://www.theregister.co.uk/2009/04...roject_canvas/
If both the BBC trust and Ofcom agree, the boxes could be made available as soon as next year.