Cloud-based (that means it streams to your "device" from the internets, rather than being rendered by local hardware) gaming service OnLive is launching in the UK... now! You can sign up on the site and begin streaming games within a couple of minutes, apparently. The games on offer cost between £1.99 and £39.99, and the "micro-console" which allows you to stream to TVs is £69.99. I am just logging in now and will post some thoughts in a bit.
(Launcher hanging... Hmm. Maybe later then.)