If you are interested wireless LAN security and penetration testing, you might really like SecurityTube. Vendor independent source of many online courses in video format. Thanks to Andrea for the pointer.
http://www.securitytube.net/groups?operation=view&groupId=9
Video topics include Wi-Fi sniffing, Pwning video frames and hidden SSIDs, hotspot attacks, SSL MITM attack over wireless, understanding WPA/WPA2, PEAP/EAP-TLS cracking and more.