Here is a list of videos published in YouTube about application security. It is a great compilation of video and a must to watch for the application developers and application security professionals alike.
All these videos are great tutorials for any AppSec enthusiast.
Note: The music is bit louder and might be annoying.
OWASP – Application Security Basics
OWASP – SQL Injections
OWASP – Cross Site Scripting (XSS)
OWASP – Strict Transport Security