Sorry for the delay, folks. I finally got the Education Directory for iPodder.org updated. There were several new podcasts to be added in both K-12 and Higher Ed categories. Be sure to check them out!
According to Adam, there are now 4213 podcasts in the directory (not counting the ones I just added). And I'm pretty sure there are podcasts out there that aren't in the directory. That's a pretty vocal long tail...
I also changed the directory to link to the web pages for the podcasts, rather than linking directly to the RSS/XML feeds. It's easier to get more information about the feed before subscribing this way.