I upgraded to iSync 1.1 on my desktop and laptop. Everything worked fine on my desktop, but I repeatedly got the error message
11:45:38AM Error Unable to get data from the server:
A network error interrupted the connection to .Mac.
on my laptop. Puzzlement ensued.
I finally tracked down the problem. Since I usually use my laptop in dial-up mode, I had "Use a network time server" turned OFF. Somehow (dead battery?), my laptop thought it was living in 1970. Fixing that fixed the problem, and now I can sync bookmarks across my machines.
(Is it just me, or does Apple need to put a little more work into error messages?)
Mac OS X Hints
http://hints.macworld.com/article.php?story=20030607121448195