If you're interested in joining the e-book revolution, consider Kobo, especially now that Kindles are no longer available at Walmart or Target. The Canadian e-book and e-reader supplier just unveiled a new family of devices, including a tablet that may be superior to Amazon's new Kindle Fire HD.
But Arc organizes content differently than Kindle or the Nook Color. Instead of media-centric (all your photos in one place, books in another folder, music in another app), Nook has created "Tapestries," which groups content by subject. A "Cooking" Tapestry, for instance, could contain cooking-centric movies, books, recipe apps, etc. You can resize both the size of objects inside each Tapestry depending on their importance. Along the bottom is a "Discovery" bar – Nook sees what you have and culls recommendations of other topic-centric content you may be interested in.