Mac owning S60 fans might like to note that OS 10.5.6 is just out, with one of the highlighted features being 'improved reliability of Address Book syncing with iPhone and other devices', so if you've been having trouble syncing S60 Contacts using iSync then it's well worth a try updating. Use the Apple menu 'Software update' feature to grab 10.5.6.  

Also, for completeness, it seems that Nokia Multimedia Transfer for Mac (Leopard) just got another minor update [I was prompted by the software, at least], but it's just bug fixes and it's still labelled as v1.4 beta - if you have this installed already, click the NMT menu bar icon and use 'Tools and Settings|Check for updates now'.