Hey themann and nctstatemed, congrats on getting in!
tarheel04, I interviewed and was waitlisted by late March. I wrote a letter of interest in late March, and then called a few weeks later in April. Within a few days, I heard a response. I just called to check on the status of my application, and the woman I spoke with told me that she would make a note in my file that I called. Not sure if this will help you. As you can see, doing nothing, to doing something, works - it's a crapshoot. But it wouldn't hurt to try (if you haven't already).
SurgeryRA, I have a friend at Duke who told me that the community at Wake is very tight, but then again, the entire class of 100 is tight, and you'll get to know your class, plus the class above you, really well. If you were comfortable on your interview day, I think that your feelings are indicative of the general vibe that you'd get as a student at the school. I went on a weekend when there were no students around, so I only got to see the Dir. Of Minority Affairs the day I was there. I had no sense of the student atmosphere, and talking to a student helped a little, but not enough to push me towards going there.
Best of luck to everyone!