This great series of videos on the squat by EliteFTS.  Unlike a lot of the stuff you'll find on YouTube with regard to lifting technique, this is actually really high quality information.  The guys at EliteFTS are the real deal:  Matt Wenning who instructs on the videos has held a powerlifting total world record in his weight category so really knows his stuff when it comes to squatting.

Anyone who is looking to improve their squat should check out the "So You Think You Can Squat" series:

Tags: squat technique So You Think You Can Squat powerlifting Matt Wenning EliteFTS