I just stumbled upon a great video training resource: The Academy

They have a nice collection of security videos including:
IronPort (Anti-Spam)
Sophos (Anti-Virus)
AccessData (Forensics)
Nessus, Nmap, Netcat, Metasploit, Cain & Abel (Vulnerability Assessment / Penetration Testing)
GIAC Systems and Network Auditor (GSNA)