My main pc is this NES pc i built late year. I thought about it and a coworker mentioned it 'has been done', so i googled it, and sure enough, like everything else, it'd been done. The ones i saw were 'not so pretty', so I decided to go ahead and build it anyways.
Intel ITX board w/integrated Celeron (conroe core) 1.2 ghz/533 fsb
1 gig ram, ddr2/single channel
80 gig fujitsu 2.5" hdd
buffalo wifi stick
sony dvd burner, slim, laptop style
DREMEL tool was my friend for about a month, so was hot glue =D
i removed the front controller sockets and added a black metal mesh grille to cover an inlet fan, there are two outlet fans, one on top and one on the bottom of the case where the original vents are. rigged the power button to a 'hold and release' style from the original click and hold, courtesy of a Dell power button, and changed the LED to blue. I took lots of pics, here are some...
http://i252.photobucket.com/albums/hh1/lxixmarc/NESPC/Picture036.jpg
http://i252.photobucket.com/albums/hh1/lxixmarc/NESPC/Picture033.jpg
http://i252.photobucket.com/albums/hh1/lxixmarc/NESPC/Picture031.jpg
http://i252.photobucket.com/albums/hh1/lxixmarc/NESPC/Picture030.jpg
http://i252.photobucket.com/albums/hh1/lxixmarc/NESPC/Picture029.jpg
http://i252.photobucket.com/albums/hh1/lxixmarc/NESPC/Picture012.jpg
http://i252.photobucket.com/albums/hh1/lxixmarc/nes/100_5946.jpg
http://i252.photobucket.com/albums/hh1/lxixmarc/nes/100_5941.jpg
http://i252.photobucket.com/albums/hh1/lxixmarc/nes/100_5939.jpg
http://i252.photobucket.com/albums/hh1/lxixmarc/nes/100_5931.jpg
http://i252.photobucket.com/albums/hh1/lxixmarc/nes/100_5938.jpg
http://i252.photobucket.com/albums/hh1/lxixmarc/nes/100_5934.jpg
http://i252.photobucket.com/albums/hh1/lxixmarc/nes/100_5926.jpg
http://i252.photobucket.com/albums/hh1/lxixmarc/nes/100_5936.jpg