Nook Tablet just got some official CyanogenMod love, the device will be getting official CM 10.1 nightlies from the big boys themselves.
The nightlies are for both the 8gb & 16gb versions. You need to have ClockwordMod installed (here is the link on how to to that). The nightlies can be downloaded from here.
For more details head over to the original thread at xda.