if you do anything to enhance your application, by all means let the school know. That can be anything from a new GPA to a new MCAT score, publication, etc..... Keep the lines of communication open and keep them knowing that you are interested.
You could ask them if there is anything you can do to enhance your application. I know someone who did that and they were able to clear the waitlist by adding another experience to their package. Don't pester them every week, but how about an email every 4-5 weeks.
Good luck. Hope you clear the list ASAP.