Did you know that NYT executive editor Bill Keller has a new book out? That's OK, neither did anyone else! It's called Tree Shaker: The Story of Nelson Mandela, and it's sold 926 copies, according to BookScan. It's a biography for children from ages 9 to 12. As Portfolio points out, it didn't really get any press. Except, of course, for two mentions in the Times. [Portfolio Mixed Media]