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.
Remove iTunes tracks disassociated from files
Assists with finding truncated iTunes Match tracks
Play through each track in a playlist at your set interval
Set choice of various number tags of selected tracks incrementally
Set the Plays of selected tracks.
Exports and then re-imports selected tracks' artwork