I can only count books that TOP readers order through Amazon, but by that accounting, readers purchased 360 copies of the Steidl reprint of Robert Frank's The Americans, based on our review, and 239 copies of Ansel Adams: 400 Photographs (the latter count includes Q4 2007) based on this review. Those were "our" best sellers this past year. I think those two were the only books that sold more than 200 copies, although numerous books sold between 100 and 200. Probably the most surprising were that 119 people bought 2008's second printing of Saul Leiter's Early Color (a bit of an acquired taste for some people, I should think, although we did talk it up quite a lot. The first printing was January, 2006).
The big surprise, book-sales-wise, was of course Fred Herzog's fine Vancouver Photographs, a book of color pictures taken mostly in Western Canada in the 1950s and 1960s that had remained unknown until relatively recently. Following our review, the book jumped from #2,200 or so to #1 on Amazon Canada overnight. TOP readers snapped up 143 copies of that one before it unfortunately sold out within just a few days; many people were left with their orders unfilled. Fortunately you can still see many of Fred's photographs at the Equinox Gallery website.
And don't forget—no matter where you live, you could do a similar project in your own town or neighborhood. Someday, everything that is ordinary and unremarkable to you will be distinctive of this time period, and many of your pictures of things we take for granted today will be of things or people that have changed or gone. No one will ever take a photograph in 2008 again, for instance—think of that.