Microsoft showed off its new retro-tastic Game Room UI for Xbox 360 in playable form at GDC last week. While the "make a virtual representation of a gaming space" idea might seem ripped straight from Sony's Home, there aren't really any actual similarities -- outside of the fact they're both in 3D, at least. You dive disembodied through the different game rooms pretty intuitively, with different company collections on the bottom "level" of the mall-like UI, and upper levels set aside for your own collections of the games. Unfortunately, once you actually select an arcade cabinet, the UI gets rather overly complex, with all sorts of modes you can play the game in, sorts of scores to be tracked and an indecipherable menu tree that makes it a real chore to exit a game.

Perhaps this is the "Valhalla" revision that we've all been waiting for? On a related note, Microsoft is currently hiring a Motherboard Design Engineer for the Xbox 360 Console Development team, with such saucy tasks as "specifying, designing, implementing and verifying the mother-board and other various sub-system boards that make up the XBOX 360 product line."