IGN's just posted a video of Keza MacDonald playing WoW and Mario Kart through Gaikai. Watch it after the break.
It works. No doubt. There it is: working. As MacDonald says in the WoW bit, the lag is "hardly noticeable". The footage was filmed in Germany; the server's in Holland.
It was confirmed this morning that the Cloud gaming service is to get a closed European beta this month.
Watch it. It's the future.