More items:

-Passwords. Even if you are not bringing a laptop, there are sometimes walkup computers you can use to check your stats and email. If you are standing at an affiliate's booth talking business, it will be handy to look up your stats with them right there.
-Pepto Bismal or Alka Selzer. Good for hangovers.
-"Magic" brownies. Less discreet in your luggage than the green stuff, and no hangover. (But you didn't hear that from me!)
-Once again, bring business cards! Some days it seems like I am the ONLY one who brings them!