Best Sellers

Harvard Book Store: Our Bestseller List
http://www.harvard.com/bsl/

USATODAY.com
http://asp.usatoday.com/life/books/booksdatabase/default.aspx

The New York Times > Books > Best-Seller Lists
http://www.nytimes.com/pages/books/bestseller/

Publishers Weekly
http://www.publishersweekly.com/index.asp