Sorry to disappoint Xbox 360 fans, but this unfortunately has nothing to do with your console. The i360 iMac Turntable allows you to place your iMac or Apple Cinema Display on it for 360 degree rotation. Instead of scraping up your desk from manually twisting the display, this turntable rotates internally so the base stays stationary. You'll probably only get about 180 degrees though, since the cords attached will snag, but useful nonetheless to allow you easy access to your USB ports.
The version for iMacs will run you $39.90 and the version for Apple Cinema Displays will cost $44.90.
i360 iMac Turntable [via iPresents via Oh Gizmo!]