Been playing with Banshee over vaction and got frustrated I couldn’t use it’s automagical conversion for my E71 or N810. Started poking around with the Hal information files and discovered it wasn’t nearly as difficult as I thought to make it work. The N810 was a bit tricky since it shows both the internal and external memory cards as mountable volumes and Banshee will only use the first. Drop the fdi files (E71, N810) into /etc/hal/fdi/information/ and all should Just Work.
Note: These files assume you’re keeping music and playlists in the Music and Playlists directories on the memory cards. If your setup is different, edit accordingly.