My new Rio Riot, unlike most other portable MP3 players on the market, ignores paths and filenames when determining artist/album/song/genre information. Instead, it relies exclusively on the ID3 identification tags for artist/album/song/genre organization.
So it goes, only a small fraction of my 60 gigs collection has normalized ID3 tags. (For some reason, the folks on Audiogalaxy and Kazaa don’t seem care much about metadata.) Editing them all by hand would’ve taken months, so I started looking around for a good ID3 tag editor. By far, the best I’ve found is Tag&Rename. It’s fast, usable, and feature-rich. One of the more inspired features is the ability to import album information from Allmusic.com (including genres, album reviews and cover art). It can also export your collection to comma-separated values, query CDDB/FreeDB, rename MP3s/paths based on ID3 tag information (and vice-versa), and so on.
That’s hard to beat, but if you’ve found a better ID3 editor, speak up.