Wear a tie, iron your shirt the night before, printout your resume, know exactly where is the interview, be there on time, have a positive attitude, cheerful, smile

, prepare yourself for some of the questions they'll ask you, write down your questions about the company, read up about the company you're interviewing with i.e. what they do, who are their clients, where are they heading, how do they make their money, etc. For internship well, be confident and proud of your knowledge<---show them you know what you're talking about.
P.S. I have a interview this wednesday as well heheheh....

a little nervous b/c its with one of the largest firm nationwide for my field of study. wish me luck

. Best of luck to you too.
--Scsi