Congratulations to Cicadaman & co. for getting Froyo running on the Nook Color! Visit the nook Color portal!
See Rooting new hardware FIRST if you have a nook original with a 1003* serial# or above.
Talk:NookColor Making system partition Read-Write
From nookDevs
An easier method that requires less typing and is easier to remember is:
adb shell
- mount -o remount rw /system
- exit