And "David" wrote: "I definitely agree with all the other posts regarding the annoying lack of page numbers on the Kindle. This is absolutely absurd! The Kindle is useless to students, educators and scholars who have to reference page numbers of a text when doing scholarly work."

Kindle users can now share passages via social networking sites, including Facebook and Twitter. And a for newspapers and magazines is designed to simplify navigation of periodicals.

Contact Jeff Bertolucci via Twitter ) or at .