Just wanted to add my congrats to the list.
DeltAlum gave really great advice. Your local library/bookstore will have tons of books on interviewing advice too, so it may help you to skim through one or two to get an idea of some of the questions that might be asked of you. Admittedly I did that and sure enough, some of the exact questions from the book were asked in the interview. Also, although this wasn't stated I feel it's important to say it...err on the conservative side. This applies to both dress and answers. Not that you wouldn't want to be truthful but it helps if you appear confident yet open to suggestions.
Good luck I'm sure you'll do great