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/or macOS. 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 29s ago
Apply selected CD's CD Text to its disc and track tags
downloaded 48m 14s ago
Export selected playlists as individual XML or M3U files
downloaded 54m 31s ago
Sort purchased tracks into discrete playlists by name or Apple ID
downloaded 57m 9s ago
Two scripts copy text from clipboard to current or single selected track's lyrics tag
downloaded 1h 15m 35s ago
Displays the Spotlight meta-data for a selected track in Text Edit
downloaded 1h 21m 10s ago
Re-associate batch of dead tracks with files from selected folder