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 39m 34s ago
Delete characters from the beginning or ending of selected tracks' name, artist, album, comments, composer, or show tags
downloaded 1h 4m 58s ago
Remove iTunes tracks disassociated from files
downloaded 1h 5m 17s ago
Displays files in iTunes Media folder not in iTunes track library
downloaded 1h 9m 2s ago
Droplet adds files, creates playlists based on folder name(s)
downloaded 1h 25m 41s ago
Title Cap various track tags, featuring editable exceptions lists
downloaded 1h 37m 14s ago
Batch merge and/or delete playlists