Amazon held a press conference here in New York today to announce the new Kindle DX, their newest version of the electronic reader. The DX features a much larger screen than previous incarnations at 9.7″. It has native PDF support, built-in 3G, and a display that rotates when you turn the device. Several major newspapers will be available on the Kindle and it was announced that a few major Universities will be offering textbooks on the device for students. Full details and purchase information are available on Amazon’s site: Kindle DX. Retail cost at this time is $489.