Hackaday, well known for their varying tech articles and being a great source for modifying and changing things from the norm has a look at the Xbox 360 in their article entitled Xbox 360 first impressions.
Why would an anti-Microsoft, pro-open source geek jump to the front of the line to grab and Xbox 360? Well, to see what it can do of course.
I purchased this box on the first day because early versions of consoles are generally easier to modify. With the PSP ver. 1.0 it was easy to run homebrew code, but with each successive firmware version, Sony makes it harder. The original Xboxes that are being sold now make it almost impossible to run Xbox Linux because of a hardware change.
They look over the Xbox 360 in detail throwing links to other great articles and pictures as they go. Very good review.