Obligatory warning: This script has been designated as an obsoleted "Retro Script". There is no guarantee that it will function as described with modern versions of iTunes and OS X. If used in its current form it may not work at all without modification and, at worst, it may corrupt or destroy data.
iTunes will stop updating a podcast if you have not listened to at least one of its episodes in five days. This script will batch-update every podcast subscription so you don't have to manually update each one individually.
I have posted instructions on how to create a launchd agent to run this script automatically and invisibly in the background to ensure that your Podcasts are always updated.
Possible iTunes bug (July 17, 2014): Looks like the iTunes AppleScript command updatePodcast command is broken as of iTunes 11.
downloaded 6m 15s ago
Remove iTunes tracks disassociated from files
downloaded 25m 6s ago
Deletes the lyrics of every track in the Music playlist
downloaded 34m 23s ago
Enter text for the selected tracks' Description tag
downloaded 36m 30s ago
Play the selected track and stop
downloaded 41m 36s ago
Export selected playlists as individual XML or M3U files
downloaded 47m 0s ago
Copy Artist to Album Artist of selected tracks