I have a similar problem.
Since upgrading to 10.4 I've found the datebook doesn't sync at all between my palm 3 and my mac. On 10.3 and earlier it worked just fine.
Now I've searched the net and found that palm 3 is no-longer supported by mac OS and iSync, nor is it supported by The Missing Sync - which I would have had to purchase to do what I used to do happily on the earlier operating system.
Can anyone advise as to whether there is a solution for this problem?
If it's not fixed by the end of the week, I'm goign to downgrade the OS. I simply am unimpressed with having to purchase a new device just because the OS no-longer supports it.
I thought Apple was cool til this point - yes you might think it's an overreaction, but I like my equipment and it all works just fine - or did before the tiger upgrade.