If you could integrate some freedb cddb lookup, gtkpod
would be even a nicer app for managing both the ipod
and local music files.
Being able to edit id3 tags is already a nice feature
by itself, but if there are some tracks who are badly
or not at all tagged, some freedb lookup would be a
great help. (maybe there's already some library aroung,
cf. easytag, tagtool)