Design studio Gridplane was hired by Microsoft to come up with a new user interface for the Xbox 360 (what eventually became dubbed The New Xbox Experience). Here is their work.
Many screens look like little more than an enlarged, green-filtered version of the original 360 dashboard, but the company developed an "immersive 3D environment" (probably seen in that first shot) to navigate much of the system. My favorite screen is actually the simplest—where all of your games span your television. Screw the folks with tiny displays who'd have to squint. I have a big TV.