I've used the method here:
http://forum.xda-developers.com/show...php?p=14915570
On three nooks so far and it works great. IIRC, TouchNooter uses the Ramdisk/etc. from the NookDevs link but preloads some things for you (like Google Apps for the Market). If you don't go the TouchNooter route, you will have to figure out some of that stuff (GMail/Market/etc.) on your own after rooting.