Playlist Manager v1.0

Playlist Manager v1.0 – iTunes only allows one playlist to be selected at a time. This applet can perform common useful tasks on a multiple selection of playlists: rename (add text, remove text, search and replace text), toggle repeat and shuffle, duplicate, delete, export, merge.

OS X 10.6 or better only.

via Doug’s AppleScripts for iTunes 30 Most Recent