It's a good thread this, I must remember to look at it at home so I can see what Marek did to his runners.
One thing that I found useful was to concetrate on keeping the form/posture of everthing above the waist. What I had noticed at the end of a race was that the coordination used to go (ie) the arms could not keep up with the legs or maybe vice versa. Either way once they get out of phase, even by a fraction, it doesn't matter how much effort you expend you will go slower.
What I found helped was training with light weights (1kg, maybe less) in each hand. I did this just for general to slow runs and found it focussed the mind on what happens in the torso. It idea was not to try and conciously "work" the arms but just train them to fit into the stride pattern. When I transferred this to racing, my style held together much more when the going got tough at the end of the race. It also helped with keeping balance when running over rough ground.
It may not work for everyone one but something else to consider. The encouraging thing about this thread is that people recognise that the running gait/style/posture, whatever you call it, is important and should be worked on.
Aodan.