Hacking Illustrated
If you’ve never heard of IronGeek, you’re missing out. He’s big into the security scene and “illustrates” a lot of different hacking techniques by recording video files.
He has a collection that he’s done himself:
http://www.irongeek.com/i.php?page=security/hackingillustrated
and a page of other’s work that he’s mirroring:
http://www.irongeek.com/i.php?page=security/vids-by-others
It looks like he’s added a lot of new material since the last time I’ve checked.
GovernementSecurity.org also has a collection of videos. Registration is required there.