You may be interested to know that Magnus has finally released MP3 Tag Studio with ID3v2 tag tool support!! Yes!

Direct quote from the blurb:

* FULL ID3V2 SUPPORT INTEGRATED!
A _lot_ of work has been done to make it
as powerful, fast and easy to use as
possible.

* New tool "Direct tag manipulation", that
can copy data between any tag fields,
disregarding their versions. Has presets
for converting ID3v1 tags to ID3v2 tags,
casefixing tags and other things.

Sounds like this could finally be the Swiss Army Knife. You can get it at:

http://www.magnusbrading.com/mp3ts

One of the few remaining Mk1 owners... #00015