There was an article in RW a few months ago about Chi Running. It just gave a basic outline of what you were supposed to do (e.g. leaning forward from the ankles, keeping your arms lower and not pumping them, and not toeing-off).
I've been trying to incorporate it into my running style, but I think it will take a few months (years?) to get it right.
I think it ought definitely to help with injury-prevention, and so long as you're not bothered about going REALLY fast (I'm very slow anyway) I think it could be useful.
It seems to me that it basically transfers some effort from your muscles to your lungs - i.e. you can go the same speed without feeling as though your BODY is trying as hard, but you seem to breathe more heavily... if that makes any sense...?
I also like the idea of "body sensing" which I think is just a new-age way of saying to concentrate on your form.
I tend to do it more on my slower recovery-type runs than on PB attempts, when I slip back into teeth-gritting/eyeballs-out mode!!