Chris Anderson's BookTour is one of those why-didn't-I-think-of-that sites. It scratches a specific itch to bring together touring book authors and the people who go to see them. Bespectacled novelist groupies are spared from the non-bookish mob at Upcoming — and vice versa. A billion-dollar idea? Of course not. But a required, um, bookmark among the New York literati by March? Yeah, I'll bet a buck on that. A side note from BookTour's About page: San Franciscans spend more per capita than residents of any other American city on books and wine.