What's on the power adapter? If it's the usual 5V 500 mA then almost any will be fine.
I recently got a Nook Simple Touch. It came with a USB cable and says to connect to computer to power up. It says a separate Nook power adapter is available for charging from a wall outlet. Can I use any USB power adapter that I have or is there a reason why I would need to use the Nook branded one. I have quite a few USB power adapters from cell phones and other electronic devices. Thanks.