You should do research on the school itself. Learn a little about the city it is in, the programs offered, grading policies, and instruction method (Problem Based Learning or traditional or mixed).
Look at the school's information packet and their web site. If you're interested in doing research in a particular field during medical school, find out which faculty at the school are doing research in that area.
The more you read about the school, the more questions you will have to ask your interviewer.
What should I wear to the interview?
Dress professionally in your style.
This simply means to dress like you would if you were a doctor, but do not lose all of your personality (i.e. if you are a guy with long hair, don't cut it; if you normally have a mustache, leave it...you are not trying to produce a standard image, you want to be yourself).
Should I bring anything to the interview?
Bring a list of any questions you wish to ask (you will probably forget most of them if you try to memorize them). Always have a pen and paper on you. Find out what the weather will be like and bring a coat if necessary. Bring your application to look over between interviews.
What will I be asked?
This is largely dependent on the school and on the interviewer (in other words, on chance). Be prepared to answer questions about "defining" moments in your life--elaborating on what you do for fun, what your favorite activity is, what sports you play, and just about anything that interests you.
Some schools still drill you though, so beware (these interviews can truly be draining). Stress interviews (empty rooms with phones ringing, being asked to open windows that are nailed shut) are very rare. If you've done research, and it's on your application, be prepared to discuss it.
Many students have recorded their interview experiences at the Interview Feedback Page.
Top Five Reasons for Bad Interviews
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Inadequate preparation.
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Applicant doesn’t listen to the questions being asked.
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Interviewer annoyed by answers to questions not asked.
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Rambling responses, providing superfluous information.
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Applicant inadvertently gives warning signals to the interviewer (inconsistent answers, abrasiveness, evasiveness, blaming others for applicant's problems, dullness).
Bad interviewing signals
Sloppy personal appearance, bad manners.
Overly aggressive or overbearing behavior.
Strong prejudices, narrow interests, judgmental attitudes.
Condescending statements about other specialties.
Arrogance, bragging about personal connections.
Hostile body language (arms locked across chest).
Poor eye contact, evasive responses.
Late arrival, looking at watch during interview.