Ben Heck is the man when it comes to building portable versions of home consoles. His latest Xbox 360 Portable is the best yet, and finally includes a built-in Ethernet port. Other features include a built-in WiFi adapter, digital pushbutton volume control, flush-mount DVD door and side panels, IR sensor for the remote control, two user USB ports and a Jasper motherboard.
For more pictures, info and a demo video.
Looks compact indeed!