I also think I managed to pass out a bunch of free copies of "Paying It Forward" without being too obnoxious about it. I left one copy in the Green Room, and a fan/friend came up to me afterward and paid me a high compliment, telling me that the story had made her cry in a few places. I was extremely touched, and gratified that she would be willing to tell me. Stories get flung into the ether, and rarely does a writer find out the influence of his or her work. I'm glad this person made a point of telling me how much the story moved her.
One other cool note -- my older brother attended the convention. He's a science fiction fan whose work schedule limits his ability to attend cons, so he rarely makes it to Boskone, but he has made it to Arisia a few times. His presence made the con that much more fun, as I got to share my fannish world with him.
By the way, I imagine gnomi will be posting a longer trip report over the next few days. I'll make sure to link to it from here.