UPDATED: Multi-Item Edit v2.0
Gee, from v1.0 to v2.0 in less than a week.
I am extremely happy with the feedback on Multi-Item Edit. So I wanted to get a new version going with more tags as soon as I could manage it.
Multi-Item Edit v2.0 lets you modify the tags of a multiple selection of tracks in a single windowyou can see everything without having to dart between tabs.
Version 2.0 adds Artwork, Name, Sort Name, Album Rating, Plays, Skips, Played, Last Played Date, Last Skipped Date, Lyrics and Category tags; sorting tags have been moved to a togglable side drawer. I also added "Checkmark All" and "Checkmark None" commands as a convenience. You probably wouldn't want to apply all checkmarked tags, but you may want a majority of them (or a minority of them) and clicking on checkboxes all afternoon is no way to go through life, son.
This is a free update for registered users. Multi-Item Edit is $1.99 with a ten day full-featured trial period.