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 3m 31s ago
Recreate a playlist such that its visible columns mirror the Music library
downloaded 7m 10s ago
Deletes the lyrics of every track in the Music playlist
downloaded 10m 46s ago
Remove iTunes tracks disassociated from files
downloaded 12m 53s ago
Append user-entered text to beginning or ending of selected tag of each selected track
downloaded 15m 57s ago
Copy selected CD's CD Text to the clipboard
downloaded 20m 31s ago
Send current song info to clipboard