It is always a struggle to know what to bring on an interview and what not to bring. You don't want to be encumbered by too much junk, but you want to look prepared. There are several items that you should bring to an interview.
• A briefcase (to look professional and to carry things easily)
• Pen and paper
• Extra copies of your resume
• Work samples (if appropriate)
• Business card
• List of references
Don't assume that sending something later will be acceptable. Be prepared, you will feel better being able to anticipate any needs they may have and you will look the consummate professional.