Mike, that screen output solution for PSP is only one of the options. There is a direct-feed method but it requires the technical know how and the bravery to disassemble the unit.

The USB screen extenders work but are kind of laggy. But maybe if someone comes up with a VNC host for maemo.

The other option would be video streaming from the 770 via wifi. But somehow I think the 770 would have a hard time screen capturing at 30 fps.