In case anyone else is Googling for this…
Nokia have released the Nokia Media Transfer app which allows Mac users to copy media to their phones conveniently. Only certain phones are supported at present, but a few more than they let on… If you have an E-series Nokia it may be worth trying.
Basically, you install the application, let it search for your phone, and if it sees it but says it isn’t supported, then quit the app and see if you can find a ‘profile’ file for your device here. Put it in /Library/Application Support/Nokia Media Transfer/Profiles and then remove anything in your ~/Library/Application Support/Nokia Media Transfer/ folder. Restart the application and you should find your phone is supported.
More info in this thread. Many thanks to all concerned- it works on my E61.