Information?: Well, the way to best unroot the nook tablet (as it's easy to see if you have done mods to it) is to do a factory system restore, so I decided why not exploit that and make it into an application? Well that's exactly what I did and best of all, it's 1 click (technically 3 but i don't count accepting SU permissions as part of the app). You need to grant SU both times it asks for it to automatically reboot.
//I take no responsibility what happens with this application or your device and assume that any problem during this process if user fault. //
Install app, open, click button, grant SU permissions (twice), and let it restore. That's about it.
You WILL lose ALL data on the tablet except the Sdcard. Be sure to back everything up using titanium backup.
1.2: Initial release
Myself for rewriting parts of the app to be a one click unroot for the nook tablet