Okay, here's my elaborate, albeit functional, solution for syncing my t509 with my powerbook:
1. On my powerbook, I already had Virtual PC installed with Windows 2k (eck).
2. I purchased a windows program called Mobile Master (
http://www.mobile-master.com).
3. Using the bluetooth setup assistant, I paired the phone with the computer.
4. I signed up for an account with plaxo (
http://www.plaxo.com).
5. I downloaded and installed the Plaxo software for OS X
and for Outlook Express (this was installed within virtual pc, of course).
6. I synced my OS X address book w/ plaxo.
7. I synced plaxo w/ my outlook express address book.
8. I mapped the bluetooth serial connection with my t509 to COM1 using the Virtual PC settings menu.
9. Getting the t509 and Mobile Master to talk to one another took some finagling. MM wouldn't find it automatically. I had to manually tell it that there was a phone connected to COM1.
10. After more tweaking within Mobile Master, I was finally able to get my contacts all downloaded to the phone via bluetooth.
I know this is a lot of steps, but it's much better than trying to manually punch in 300 contacts and their respective phone numbers.