<p>I had another thought. If ND is having a day in April for admitted students, maybe you could ask if you could attend, even if you're on the waitlist..it would show additional interest. They may or may not let you.
Aslo, I spoke with an adcom about waitlists a few months ago and they said alot of times they don't rank them because they try and admit people off waitlists who have no financial need..which would stink.</p>