I went over everything, papers from my research and my PI's so I could babble about it confidently, my amcas and my secondary, also my friend who is a year ahead of me at texas tech gave me this book "The Complete Book of Medical Schools" by the Princeton Review (mine is the 2003 version) and in the beginning it has pages and pages of possible interview questions , . . I answered all of these on paper and then read them over on the plane ride there. None of the questions really came up in my interview because it was oddly conversational, but it made me confident that I could handle anything they threw at me. Then the night before I took myself out for a relaxing evening (which for me translated into an awesome steak and a glass of my fav expensive wine) and tried just to keep myself calm. Just be yourself in the interview, try to be confident in the fact that you rock and if they don't see it they obviously smoked too much crack that morning. This is what I did, I've always interviewed well so I'm not sure how much of it is a natural knack, but don't let yourself be freaked out by all the overachievers here on SDN.