2iTunes: convert audio tracks while importing (readable droplet) - Mac OS X
droplet to convert audio tracks while importing in iTunes, or convert again tracks using current iTunes import settings

Artist/Album Playlists (readable script) - Mac OS X
create playlists per Artist+Album

Show iTunes Library in Safari

Save Playlist tracks… (readable script) - Mac OS X
copy file tracks of current playlist

Save selected tracks… (readable script) - Mac OS X
save selected file tracks

Scan for missing files (readable script) - Mac OS X
find tracks whose file is missing

Scan for orphan tracks - Mac OS X
find file in iTunes Music folder but not in Library

Selected tracks info (opensource script) - Mac OS X
number, size and total time for selected tracks

Set enabled… (readable script) - Mac OS 9, Mac OS X
check, uncheck or invert check for selected tracks

Set EQ by genre (Mac OS X)
set EQ preset of selected tracks according to genre