The CPEs I'm referring to today are (and aren't) free, unfortunately. I just recently got access to my SANS OnDemand class (SEC503: Intrusion Detection In-Depth) [http://www.sans.org/ondemand/description.php?tid=5016], and I wanted to learn some in-depth snort before entering that chapter of the class. To that end, I went and found some documentation on it.
So I'm thinking self study, outside the class, should be worth one or two type B credits, at least. However, there aren't many "official" webcasts to work with, so I threw up some VMs and have been tinkering around with Snort in my own learning way. Let me know if you think they'll be worth some credits, and I'll update this post!
Here's the link to the official documentation for Snort: