Barnes & Noble today unveiled its new Nook Tablet, which comes preloaded with apps from Netflix, Hulu Plus and Pandora. The boost in entertainment options compared with previous versions signals the company’s intention to compete in the space against the likes of Amazon’s Kindle Fire and Apple’s iPad. And it is throwing down the gauntlet just in time for the holiday buying season: Nook Tablet is set to begin selling around November 17 for $249.