I have my music and podcasts spread out in different iTunes libraries. So if I sync items, tracks from another library are deleted from my iPod -- therefore I manually manage my tracks. The downside is when you connect a manuall-synced iPod to iTunes, your ratings, played date, counts, etc. don't get synced with the iTunes Library. So I created this simple AppleScript that syncs tracks on specified playlists on your iPod with matching ones in iTunes. I realize other AppleScripts exist to do this already, but I wanted something which required no user input and simply did what would happen if the iPod was in automatic sync mode.
[robg adds: I haven't tested this one.]
Mac OS X Hints
http://hints.macworld.com/article.php?story=20070504063408330