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 13m 55s ago
Resample selected tracks' artwork to user-set size limit
downloaded 21m 41s ago
Displays files in iTunes Media folder not in iTunes track library
downloaded 32m 24s ago
Copy chosen tag info from one set of tracks to a different set of tracks
downloaded 38m 33s ago
Convert selected tracks and export the converted files to a new folder
downloaded 46m 58s ago
Delete characters from the beginning or ending of selected tracks' name, artist, album, comments, composer, or show tags
downloaded 47m 49s ago
Copy Artist to Album Artist of selected tracks