XDA forum member japzone wanted to be able to Dual-Boot from the MicroSD card and choose to boot either to Nookie FroYo or Un-Rooted Stock. The reason for Un-Rooted Stock is so that the XDA member wanted to be able to receive the B&N updates.
With the help of another XDA member Rookie1, Nook Color owners can now try out dual-booting between FroYo and Stock!
Now whenever you turn on your Nook Color, you have three options:
Pre-requisites include a working Nookie FroYo or Honeycomb MicroSD card, and the u-boot.zip file.
For more information, check out the modification thread._________