Congrats to all of those who have finally received official notification of their acceptances to Duke.  For those of you who got the "alternate" letter, I feel your pain.  I was in your position last year, and I eventually got "the call" in June.  Duke was my #1 choice, so I jumped at the chance.  I think there are actually 6 people in our first year class that were pulled off the list last summer.  They never told me my ranking, but they eventually told me that I was in the top half of the list (never found out how long that list was).  As for things I did, I sent an updated transcript/activities list, and I let them know that if accepted, I would definitely attend.  I don't know if it helped, but it didn't hurt.  I know the waiting is horrible, but next year when you're knee-deep in Microbiology, it will seem like ancient history.