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.
Change case of selected track names to sentence caps
Copy Artist to Album Artist of selected tracks
Locates pairs of track entries pointing to the same file
Re-associate batch of dead tracks with files from selected folder
Play through each track in a playlist at your set interval
Set the Plays of selected tracks.