This script uses the UNIX qlmanage command to display a Quick Look window of the selected track(s), which can be audio, video, and, perhaps most usefully, PDF, whereby Preview.app is not necessary. Also handy for playing a single track out of playlist context. Need I add that a keyboard shortcut makes this very handy.
Caveats: 1) under Leopard a media file will begin playing immediately, so the script uses a hack to prevent this, 2) under Snow Leopard and better the QL window's title contains "[DEBUG]" which cannot be suppressed, and 3) the QL window can only be dismissed by clicking on its close box.
Locates pairs of track entries pointing to the same file
Move selected playlists to a new or existing folder
Perform various tasks on a selection of playlists; rename, delete, duplicate, merge, more
Batch-extricate playlists from a selected Folder
Batch merge and/or delete playlists
Batch-append text to comments