Cleaning up your squat form (back squats and box squats)
This is by far one of the better articles on squat form. It's a very in-depth analysis on how to squat properly filled with pictures as well for all you visual learners out there. It's a MUST read if you feel like you're having problems with your squat form.
“The greater danger for most of us lies not in setting our aim too high and falling short; but in setting our aim too low, and achieving our mark.” -Michelangelo
Absolutely excellent article, Joe, a must read for everyone who squats. Shame so many learn their squat form from Rippetoe rather than articles like this.