Here are a few links. Have fun, I have a Visor Prism and love it. If you find a good logbook program for the palm on your travels please post it back here.
http://www.eurocool.com/
http://shawcable.pda.tucows.com/palm.html
http://www.visorcentral.com/index.php
http://www.palmgear.com/software/
Cheers
Canuck