Online retailer Amazon has today confirmed that Walter Isaacson's Steve Jobs biography led in combined Kindle and print book sales at its storefront during 2011. "We chose ëSteve Jobsí as one of the Top 10 best books of the year, and even though it was published in October, the sales have been phenomenal in both formats," comments Amazon's senior editor for books, Chris Schluep. The title was earlier announced as Amazon's bestselling book of 2011, but that ranking appears to have excluded Kindle editions.