Amazon follows up their recently revealed Fire, with a bolster to their popular Kindle tablet. Joining a roster of services like Netflix which offer endless viewing, the Seattle-based company has just announced an unlimited e-book subscription service for any Kindle or Kindle app-enabled device. Users will pay $9.99 a month for access to over 600,000 titles plus more than 2,000 audiobooks. The announcement places Amazon among other rival services offered by Scribd, Oyster and Entitle. Although the announcement may not be as exciting as their aerial vehicle delivery program to some, the service will undoubtedly come as welcome news to bookworms far and wide.