With 10.4.6, the patch to MetaClasses.plist for N80-1 did not work properly for me 😟 Syncing aborted part way through ("reset by phone" at different points each time) and strangely the number of items to sync reported by phone does not match up with the number of contacts in my address book (364, some with images). Syncing does not even get to calendar sync. Syncing with my Sony Ericsson T610 works fine.
Undo patch to MetaClasses.plist, update to 10.4.7, N80 is still not supported by iSync :-((
http://www.apple.com/macosx/features/isync/devices.html
(this forum doesnt have 10.4.7 as a OS version choice yet either)
iBook G4 Mac OS X (10.4.6)