Same situation here, unfortunately. Both my "n" Home button and the Button Savior Home button now point to the Nook's Home rather than the Android Home. I can't access that in order to install a new launcher/app that would fix it (as I can't access the Marketplace), and I can't turn on ADB Wireless because that, too, is an Android app I can't access.
I tried re-rooting the Nook; bricked it. Did a "factory reset" (restarting and holding down the left & right buttons; Nook said it was restoring to its original settings. Ended up exactly how I was- all my books were there, as was the non-working Button Savior).
Any other help is much appreciated. Thanks!