Same here although i was interviewed on 7th march. From the previous posts, i believe there is some unofficial wait list. I think that the people who get accepted 2-3 days after their interview are those with excellent profiles and the interview was merely a formality to get it over with. Unfortunetly for the rest of us, we are put on hold until soneone probably rejects or accepts their acceptance offer, hence only the 2 week deadline to accept or reject the offer. At this point no news is good news but if my admission depends on someone rejecting an offer on NCSU, well you dont need to be a genius to determine that the odds arent in our favor. Well atleast thats what i think.