I have been meaning to post this video for a while
and just got reminded of it by the Barefoot Runners NYC blog.
Even though this was put out by a shoe company,Terra Plana (Extremely good if very expensive shoes) it uses the "barefoot" methodology to teach proper running form.
If you are interested in exploring a more natural stride and one that seems to have a lot less injury associated with it, this is a very good instructional video.
With or without shoes, the fore foot strike is, for me, the very best way to run.
So kick off your shoes and give it a try.