I recently bought and modified an Orion Teletrack telescope mount for taking gigapixel pictures:

http://www.papywizard.org/
http://www.brewzone.com/2008/11/diy-pano-head

It was a very easy build, taking a few hours on Sunday morning. It's a little tricky installing the software, but the instructions are clear.

The best part is that I've been keeping the N800 in my camera bag to use as a viewer anyway. The full size SD card is still a great feature in a mobile device.

I just hope I can get a new battery when the current one dies.