A modder by the name of Bandit5317 created this amazing mod of an original Xbox, cramming in a 320GB HDD (though no optical drive) in the process. It took six months to build, but looks absolutely amazing.
The polycarbonate case holds the guts of a flashed Xbox, so even though it's got no DVD drive, it'll serve as a great media center with the help of XBMC. It definitely makes the current crop of consoles look bloated in comparison, though we're told it runs a bit hot due to the tight quarters inside. Still, it's a great mod, especially given the original Xbox's considerable girth. [Xbox-Scene via Engadget]