Oprah Winfrey’s endorsement on a product is almost a guaranteed bestseller. She has the Midas touch when it comes to endorsing books and other products (I can’t tell you how many times people still look for that Netty Pot to clean their sinuses). Oprah’s latest book pick, A New Earth by Eckhart Tolle, is no surprise – a hit with readers. It’s a self-help book that Barnes and Noble reports is their fastest selling book ever. Amazon.com reports the same. The book’s publisher, Dutton, an imprint of Penguin, has shipped 3.5 million copies since she announced A New Earth as her bookclub pick a month ago. Another plus for the publisher is that Winfrey will be meeting with the author every Monday for ten weeks to discuss the book in a seminar that will be presented on a international platform. Half a million people have already signed up for it. GO Oprah.