I will agree that stretching is essential, but I would caution against a one thing, mainly excessive stretching in between or prior to your sets. Stretching to warm-up and allow you train safely through a full ROM should always be done, but intense stretching can promote brief periods of joint laxity, which can actually increase the risk of injury during heavy resistance training. I actually have some material on this, but it will have to wait until I go into the office tomorrow morning.
Yes, I am somewhat playing devil's advocate here, but people are saying the borad is slow, so . . .