I did actually end up signing some books — mostly Wild Cards, but also a cookbook and some copies of Survivor for a bookseller. I got restless after half an hour though and abandoned my table to go take photos and chat with friends.
In my defense, I bought Kansas City fudge at the shopping mall, and left it at my table so if anyone was disappointed not to find me there, at least they could help themselves to fudge. (Three flavors: raspberry cheesecake, maple pecan, and espresso chocolate.)