My mother couldn't get ADE to authorize her new Nook HD for her books she checks out through the library. However, we did find that B&N has available through their site free apps for both libraries that use Overdrive Media Console as well as libraries that use the 3M Cloud Library. All you need to do is download these free apps to be able to directly download from your library's site into your Nook.
Overdrive Media Console: http://www.barnesandnoble.com/w/overdrive-media-console-overdrive-inc/1113021293
3M Cloud Library: http://www.barnesandnoble.com/w/3m-cloud-library-3m-company/1113021300
Once you have downloaded the correct app for your local library you can access the app in with all of your other apps. Within the app it's self is where you can find your library books. My mother was so excited to find out we could do this and just forget about having to transfer her books from the computer.
As far as books from other sites, I'm not sure that these apps would download them, however I haven't had a chance to test that theory out.
Hope this helps you out and wishing you happy reading.
For books that you can't find an app to do a direct download to the Nook, but can download to ADE on a PC/Mac.
- Get the books on the PC/Mac using ADE.
- Copy the .epub file to the Nook.
- Make sure the Bluefire app is authorized with the same AdobeID as the PC/Mac
- Read using the Bluefire app on the Nook HD.