Here’s a detailed article on rooting the Nook Color reader device to expose its full Android capabilities. “There are two different approaches to turning the Nook Color into a tablet: you can root the Nook Color’s default software environment and extend it with third-party applications, or you can run a conventional Android environment by booting a custom ROM image from a microSD card. The custom ROM images are an appealing option because they offer the ability to get relatively close to the stock upstream user experience. Unfortunately, the custom ROMs are still highly experimental and aren’t quite yet ready for day-to-day use.“
Read more at LWN