You can improve by reviewing Ben Stoeger's Dry Fire thread. He has a df program dedicated to shooting on the move. When you df, call your shots and be honest. If they arent good, keep working on it.
Also try http://www.youtube.com/watch?v=sjxiCxL3bYA
Max Michel breaks it down nicely.
Then video yourself and post it on youtube. Others will post their helpful comments.
Couple of important things. Knees and elbows bent, they are great shock absorbers. Heel toe moving forward, toe heel moving backward. Know the ground you are moving on. Disturb the gun as little as possible.