As told in the FAQ the ID3 Tag Studio is a very cute program to manage the ID3 tags. You can find it here.

You can fill the ID3 Tags with the name of the files, you can mass-set ID3-Tag (every field separately - i.e. move all "Rock"-mp3's in a directory and then mass-set the Genre Tag from all those file to "Rock"), you can rename all selected files based on the ID3 Tag etcetc.

Worked really good for me (and others, too)

TeeMcBee
Got my Mk2! # 080000143