I'm not much of a gamer myself but I see that OnLive is launching in the UK in June. With a broadband connection a PC, Mac or TV becomes an on-demand games console. Be interesting to see if Virgin and Tivo incorporate this when launched. It's something that Sky can't do and might even be Virgin's killer app.
http://news.bbc.co.uk/1/hi/technology/8556874.stm