Don't buy that Kindle book! Borrow it! Annotate and bookmark as if it were your own book. If you ever check it out again or buy the Kindle copy from Amazon, your annotations will be right where you left them.
That simple e-reader that is supposed to replace all the textbooks with a 8 oz backpack device is about to get an upgrade.
Could an e-reader be the only 'book' that kids (students) in the future will ever know? We just marked Earth Day; what would the Lorax vote for: paper or silicon?