Following up on my overstriding post, one of the most effective "cues" I've learned to combat this is to run like there is someone in front of you. The idea is you wouldn't want to kick the person you are running behind and so it forces you to shorten your stride.
I actually did this drill in my Pose lesson years ago. I put my hands on the instructor's shoulders and we ran around the parking lot. I found it very effective in making an immediate change in my form.