Barnes & Noble announced some enhancements to it its Nook e-reading software for the PC, iPhone, iPod Touch, and iPad. There is a completely new app for the iphone and iPod. "Completely new, the next-generation NOOK for iPhone application delivers the most personalized and easy-to-use eReading experience for iPhone and iPod touch owners," the company says. "NOOK for iPad adds customer-requested, in-app content rating and other improvements to the company's popular iPad app,