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.
Re-associate batch of dead tracks with files from selected folder
Import CD tracks using any encoder on the fly
Display, create text file listing info of dead tracks
Locates .m3u files and allows you to select which to delete
Export artwork of selected tracks to parent or specified folder
Batch set new Last Played/Last Skipped of selected tracks