Hey, what's the etiquette on this sort of thing?  Can I bring all the books I own, or just the hardcovers, or just one?  Am I obligated to purchase something at the Poisoned Pen (not that that's a problem.)  Last time I was at a signing I was 8, and I just vaguely remember standing in line and Anne McCaffery smiling at me.  (My mom took me.  A very nice lady, and I still have my signed book.)