Er, that chip is a BGA, and the ID pin (D3) is right in the middle.
I think SpeedEvil made quite an understatement when he said on the wiki that this would be a "challenging" rework job.. @_@

Even with the schematic it could still be next to impossible with a multi-layer PCB.

This is a real shame.. I was literally just about to buy one of these as I am developing some robot control software for the USB AVRs. 3G connection and fast processing on an n900 would have been wonderful..