I have been able to get a hold of an USB adapter and have tried to take a picture from my N800. Unfortunately it failed.. My setup: N800 connected to a Nikon D60. For the record, I'm able to capture images from my desktop with gphoto2.

This is the script I have used:

http://bastiaannaber.com/tmp/gphoto.txt

And this is the output:

http://bastiaannaber.com/tmp/my-logfile.txt

The error:

context(0): An error occurred in the io-library ('Unspecified error'): No error description available

Hmm... anyone any suggestions?