Engadget take a Sunday afternoon tour of the Xbox360 offices... "Xbox HQ is off-site from Microsoft’s main campus in Redmond — apparently they wanted Xbox to function as its own independent creative unit apart from regular Microsoft operations. Click on for the full tour!
The central Xbox Live NOC is in an undisclosed location, but at Xbox HQ they have a 350+ server testing environment for developing new versions of Live, as well as debugging problems with the, uh, live version of Live. One hall proudly displayed flowcharts of every possible 360 screen. We had no idea how many there really were."