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.
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Use special track to stop iTunes, cue next track
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Apply selected CD's CD Text to its disc and track tags
downloaded 44m 54s ago
Gather audio tracks whose files contain no artwork metadata
downloaded 47m 3s ago
Resample selected tracks' artwork to user-set size limit
downloaded 53m 12s ago
Exports and then re-imports selected tracks' artwork
downloaded 1h 7m 57s ago
Export selected playlists as individual XML or M3U files