From benheck.com:

A few months ago I announced that I would be building a few more Xbox 360 portables, and well, here's one now! While it looks similar to the previous model it's once again a from-scratch redesign and has the following features:
* Built-in Ethernet port, finally.
* Built-in WiFi adapter, as usual.
* Digital pushbutton volume control rather than a clunky knob. I used a different audio amp as well, and it sounds a lot better.
* Flush-mount DVD door and side panels (such as the memory card slots)
* IR sensor for the remote control.
* Two user USB ports.
* More air holes!
* Jasper motherboard.
Full Story: benheck.com