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 25s ago
Write size of track's artwork to chosen tag or copy tracks with artwork of certain size to playlist
downloaded 1m 57s ago
Change video kind and video related tags of selected video tracks
downloaded 3m 19s ago
Perform tasks on a batch of playlists; rename, delete, duplicate, merge, more
downloaded 4m 7s ago
View/Edit tags of selected track(s) in single window
downloaded 4m 54s ago
Droplet adds files, creates playlists based on folder name(s)
downloaded 6m 53s ago
Convert selected tracks and replace them with converted versions