FWIW, I'm in the same boat with my 770, and was able to create a custom firmware that loads usb networking and x11vnc. This was a few months ago, and I remember x11vnc for OS2006 to be quite hard to find - I'll see if I can locate the package again.

Right now I'm trying to configure it as a wireless bridge, but I need to compile the right kernel modules for that - and it's hard enough to find this rather dated kernel source _and_ matching scratchbox.