The simple question of how do you run is largely unanswered in the running community. You have a bunch of pseudo-guru styles like Pose or Chi, but the key to running correctly to maximize performance is a topic that is largely left to elite coaches or biomechanics experts. As Pete Larson pointed out in his blog, elite coaches like Alberto Salazar extol the benefits of working on running form, but no one has told the masses how. In the following article, it's my goal to unmask the "secrets" and provide the answers. The bulk of this article comes from information gleaned mostly from working with world class track coaches like Tom Tellez and a great High School coach in Gerald Stewert. Throw in some biomechanics classes in undergrad and graduate school and the picture is a little more complete.
I don't know if I can put it better than that. It's worth a read.