Have you been reading about Macmillan's titles buy links being removed? Apparently, Amazon and Macmillan are in disputes about the pricing structure of their e-books. If you are interested in reading the full story you can find it here http://www.thestreet.com and search for amazon pulls macmillan titles. Today on the Kindle site of Amazon, they posted a reply to the debaucle going on.
Amazon says they will ultimately have to give in to Macmillan. Many are asking why.