Go check out LifeHacker for a cool idea on discovering new audio/video content.
The gist of it goes like this:
In iTunes, subscribe to a custom feed.
Make that custom feed a RSS URI from Del.icio.us that points only to the media you want to grab. (mp3, mpg, etc, etc) more here
Add +[tag] to narrow the results.
There may be some great automation possibilities here. There are some comments on the thread referring to AppleScript, but I’m thinking Automator may fit the bill too, depending on what you wanna grab.