UssDfiant,
If you haven't heard anything, you should consider contacting them by phone. I had the same problem two years ago after my interview, so I called to find out what the status of my application was. Fortunately, they faxed me a copy of my letter and then I went down to school the next day to drop off my deposit and fill out my paperwork. Actually, I am still waiting for my "official" acceptance letter (and I am a second year at PCOM).
Best of luck! 🙂