I just found pyring. It can read a palm database file (pdb) used by the palm program keyring. I was using keyring on my palm tx, so this works well so far. It can read and update the file. There is also a KeyringEditor.jar that can be run on windows (and I assume linux as well). I kept the file on my sd card on my palm and could put the sd card in a reader on my desktop to read and edit the files. Should be able to do the same with pyring and the n800.

I just started using it so we will see how it works out.