I don't think this has been posted:
I just built a card to boot to because I want to keep the Nook itself stock. It's really incredible. It almost makes me regret buying a Nexus 7 for myself. This one goes to my very lucky sister-in-law.
ETA: If you are running off a card, don't cheap out. Buy a good Sandisk class 4 card. Don't even try Kingston.