And if you cant FTP you have to edit the MXM.XBE file to TRUE for DHCP.
Also, making a media centre for the cost of one old xbox and a 10 copy of mechassault is awesome. Especially when you set it up to stream the 200 gigs of tv on your computer and you install a whole wack of emulators.
The important things to know are you need an orig. copy of mechAssault, no game of the year or greatest hits.
Also the serial etched on the plastic near the centre of the disc has to have a 0L at the end. The one with 8L doesnt work. I found this out the hard way and had to go back to Gamerama and exchange it for the correct one. This is the half the reason it took so long.
Also, when installing MXM.Xbe you need to edit it in word pad to change it to allow DHCP. If you dont do this you will be stuck with it having a IP of 192.168.0.3 The instrustions for this are in the discussion link on the product wiki page.
It is the greatest xbox functionality ever. Watching Deadwood stream off the media drive on my computer right now. Its a lot nicer to watch on my TV then my little computer screen.