Thanks for the tip. I happen to own MusicMatch, but I don't use the library part so I didn't know it could do things like that.

However, I'm looking more for a checker than an editor. I want something that I can throw a directory at and it'll tell me if all MP3's in it are correct (particularly, if they have correct VBR headers) and formatted the way I want (with only an ID3v2 tag and no ID3 tag, for example).