Amazon's New Dual-Screen Patent - What Does it Mean for Nook and Other Dual-Screen Competitors?

From Engadget:

Looks like the battle for e-reader dominance between Amazon and Barnes & Noble could soon expand beyond the recent spate of price drops and into the courtroom as well: the USPTO just granted a 2006 Amazon patent on e-readers with secondary LCD displays (like the original Kindle's scroller-navigation panel), and several of the claims are potentially broad enough to cover the Nook and many other devices with both electronic paper and LCD displays. What's more, Amazon agreed not to file for any corresponding foreign patents during the four-year approval process and thus wasn't required to publish the patent application -- meaning this is likely a complete surprise to the entire industry. ...