patterns & practices Security Videos
We did a focused set of security videos with Keith Brown a while back. The problem is they're not very findable (most customers I talk to aren't aware of them). I added them to soapbox and listed them below to see if it helps (note soapbox may prompt you to log in):
Input and Data Validation Videos
They're designed to help you get key concepts behind some of our security guidance. I also wanted to use somebody that was recognized in the field as somebody you could trust. Keith's proven himself for a long time in the security community. He also has the aura of an experienced trainer, which I think comes across in these videos.