We’ve known for a while that the Xbox 360 is running on IBM’s PowerPC architecture, the same as you’ll find in Macs, but I guess the notion that the easiest way for Microsoft to ship some alpha development kits out to developers would be to use Power Mac G5s escaped me. You have to admit that it’s a funny image to see Macs, complete with big Apple logos on the sides, with Microsoft labels and “Xenon” branding (English coverage on Kotaku and Engadget). I’ve heard that Microsoft has been known to lift from Apple but this takes the cake…