Presented for your voyeuristic pleasure, the motherboards of the original Xbox 360 and the redesigned Elite. There's no word yet on whether the CPU is the rumored 65nm revision, mostly because I don't think you can tell the difference just by eyeballing the chip. ("Say, Bob, would you say that's more like sixty nanometers, or ninety?")
The gang at Llamma.com, who obtained and tore up the Elite in question, were apparently very excited at some of their findings:
Inside the Xbox 360 Elite [Llamma.com, thanks Charlie]

