OK, I'll play along:
Number of Books I Own: I don't know. A lot. I have a floor-to-ceiling library in my home (hard cover); fiction is categorized by author, non-fiction by subject.
Last Book Purchased: Kremlin Rising, Vladimir Putin's Russia and the End of the Revolution, by Peter Baker and Susan Glasser.
Last Book I Read: Little Children, by Tom Perrotta
Five Books that Mean A Lot: This is a painful exercise, like forcing a parent to choose a favorite child. To make it a little easier, I'm restricting my choices to fiction:
Eugenie Grandet, by Honore de Balzac
The Leopard, by Giuseppe Tomasi di Lampedusa
Humboldt's Gift, by Saul Bellow
The Wapshot Chronicle, by John Cheever
Lonesome Dove, by Larry McMurtry