There's a great article in June 2011's issue of Runner's World that begs the question: does form really matter? You can find it in it's entirety here.
Here are the biomechanics of elite runner Ryan Hall's run. Can you say the same about yours?
"In slow motion he almost appears to bound. He keeps his upper body still, leaning slightly forward, with his back straight, his arms half dropped, and his palms open. He lands on his midfoot, not his heel. Even at 300 frames per second it is hard to tell exactly when he touches down - it is a gradual, fluid motion. At the same time, his opposite leg extends backward, drifting along behind his body until he pulls it forward and back into service."