Barnes and Noble's just made version 1.5 of its Nook e-reader's firmware available. What can Nook owners expect from this latest upgrade? Well, the company says it boasts improved page refresh rates about 50 percent faster than the previous version -- which is good news as we found it to be slower than its competitors. The update -- which is available for both the 3G and WiFi versions -- is also Barnes and Noble's largest to date for the readers, and includes other fixes such as syncing across devices like the Nook's various apps, customizable folders for you
