Amazon announces textbook rentals for Kindle

Amazon has just announced textbook rentals for the Kindle, which will save students up to 80% on textbooks, which are normally rather pricey. These textbooks can be viewed on any tablet, smartphone, or computer. You will be able to rent the text books for any amount of time from 30-360 days. The annotations you make will be stored in the cloud and you will be able to view them anytime on Amazon.com, even after your rental expires. And I thought getting a digital version of a textbook saved enough already...