I was told to bring a copy of your CV (actually a resume- the shortened form), extra photos, a copy of your CAP, copy of your personal statement, pen, paper, etc...went to Kinko's to make some nice copies of my resume on good quality paper...
Been on four interviews...not one of them asked for any supplementation. There was one interview where I went ahead and gave the program coordinator an extra copy of my photo only because the other applicant did so. Had he not done it, I doubt they would have asked.
I have been told to bring thank you cards, though. That way you can write them before you leave. The sooner they get the thank you card the better!
good luck!