A few people have asked me for reading material to help them before their medical school and residency interviews. For something quick but thorough, take a look at my part 1 and part 2 pieces of "How to Prepare for Your Med School Admissions Interview."
And regarding interviews...having someone examine your head in the interview setting can actually be fun if you've prepared well :). Please plan your mock interview(s) with me as soon as you get your first invitation, as I'm scheduling 1-2 week in advance.