FixTag is a Java MP3 tag editor. It searches for MP3 files with inconsistent filenames and ID3 tags, supports individual editing as well as batch updates of ID3 tags, and automatic file renaming based on a user defined pattern. Supports ID3v1 and ID3v2.x
I have used this program for YEARS now, and it is still the best. For quickly renaming files and updating multiple ID3 tags, this is it right here.