I had purchased a couple of brands of Palm/USB cables (including the Targus cable) that allow charging and synching without the cradle. I had OS 9 drivers (which were a bit flakey), but had not seen OS X drivers until now. I searched VersionTracker for something, but no listing. However, after some more digging, I found the OS X drivers (and another version of the cable) on this page. They work well for me, and save travelling with the cradle.
Mac OS X Hints
http://hints.macworld.com/article.php?story=20030510044814724