Bring a professional looking binder with you so you can jot down a few notes during your interview. This conveys a sincere interest in what your interviewers have to say, and gives you a chance to jot down a question to ask at the appropriate time.
When I say a professional looking binder, I'm not talking about a cheap 3 ring binder like you carried around in the 8th grade. Invest in a leather binder that looks first class. Also, don't use an IPad or electronic tablet to take notes unless you're applying for a programmer or other IT position.