Several people wrote in yesterday to tell me about James Tuley's MacOS X program IEatBrainz. (Great name by the way.) This looks like it's getting close to what I need. I could use a standard program to record analog audio on my PowerBook, import the unidentified tunes into iTnes, and then run IEatBrainz to tag them. Based on the reviews I read, this program isn't quite stable enough yet for my tastes, but in a few months it might be. I'm still surprised that nobody's tried the much easier approach of asking you to identify the artist and album, and then looking up the song information.