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 49m 23s ago
Remove iTunes tracks disassociated from files
downloaded 1h 1m 25s ago
Locates pairs of track entries pointing to the same file
downloaded 1h 1m 50s ago
Delete characters from the beginning or ending of selected tracks' name, artist, album, comments, composer, or show tags
downloaded 1h 2m 14s ago
Removes leading and trailing space characters from chosen tags in selected tracks
downloaded 1h 2m 44s ago
Two scripts copy text from clipboard to current or single selected track's lyrics tag
downloaded 1h 25m 16s ago
Renumber order of selected tracks