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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Delete characters from the beginning or ending of selected tracks' name, artist, album, comments, composer, or show tags
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Copy Comments tag to Description and/or Long Description tag of selected track(s)
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Create a text file listing most played artists
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Sort purchased tracks into discrete playlists by name or Apple ID
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List tracks common or exclusive to two playlists
downloaded 1h 26m 8s ago
Set choice of various number tags of selected tracks incrementally