I'm in the same boat as you. I was wait listed at Catholic, which is one of my top choices and I really want to get accepted. I contacted the admissions director and he said to send in a rec (preferably from a current employer), updated transcripts is applicable, and a letter describing why you want to go to that school specifically over any other one.
Good news is, people do get off wait lists. I was wait listed at Hofstra in January and they accepted me off the list a week ago and also told me that I am a finalist for a child advocacy fellowship. I'm pretty happy about that, but I'd still like to live in DC over Long Island.
Would you want to exchange emails?