I've been using this new app for about a week now, totally cool, and downloading books from my pc to my nook is really fast. Really nice view of your downloaded library that includes a wide variety of sort features. Very easy to set up where you want the books to go on your nook, which I never seemed to have much luck with using the usb connection. For me, it actually seems to work better than using a usb connection. Great addition to a great program. I can't say enough about Calibre.