iPhone address book sync

[tri3tsch]

For some reason, my iPhone stopped syncing with my Mac Leopard Address Book. No changes were made to the computer. I have tried deleting the sync history, deleting iTunes and reinstalling, deleting all address book entries on both Mac and iPhone and then adding back one small group, deleting abd.plist and plist for Address Book. I'm running about of options. Anything else to try?