Amazon announced a number of “milestones” this morning for early holiday sales that featured the success of the Kindle family. Among them: Cyber Monday was the biggest day ever for Kindle sales worldwide; the top 4 spots on the worldwide Amazon best sellers list since launch nearly three months ago are Kindle e-readers and Kindle Fires; and 9 out of the top 10 best-selling products on Amazon worldwide since September 6 are Kindles, Kindle accessories and digital content.