I'm finding all of these clumsy (but workable in a certain way) for my situation. I have MP3s that I have no idea what album they are in the first place. I do have artist and title (some truncation - about 15 ~ 20 characters of both). The problem with all of these programs is that they expect the same album to be grouped together in the same folder.
I'm finding that Microsoft Zune has the best, easiest to use interface for finding album and album art. HOWEVER it's not updating the tag. That I can tell. It seems to be storing the information off in perhaps a 'library' file somewhere including album art as a hidden tiny jpg image. I bet when I transfer all of these over to my Creative ZEN _or_ if I find all this stuff, then use one of these other programs to rename/reorganize my MP3s by album folder instead of (PUNK) and (NEW WAVE) folders, then my library would get terribly confused and I'd lose all the work I'd done in Zune.
Anyone have any specific ideas on helping me out? IF Zune would alter the MP3 directly it would be a godsend. I was also directed to musicbrainz but I haven't gone there quite yet. Also I might try to add Microsoft's server to Media Monkey, which is my next choice albeit awkward...but I don't think that the database information is going to help me as much as core program functionality.