Well, it's always nice to see a fellow Mac user in the loop. I'd be happy to create a forum category specific to the Mac if there is enough interest. If others chime in and see a need, then I'll set it up.
Regarding your question....
For Mac users, I suggest you look no further than the very excellent Mark/Space Missing Sync software for Mac users. It supports Tiger (I can attest to this) and offers a host of features you will not find in the Palm Desktop.
Here's a link to a
review of Missing Sync
I don't use Entourage (made the move to Apple Mail a while back), but it does support syncing through Entourage.