Original thread : CM9 for Nook Tablet Alpha 0 - xda-developers

a Very alpha version of CM9 has been released. This Rom REQUIRES a kernel upgrade from 2.3.5 (off the top of my head), which is what we all are now even with CM7, to 3.0. This means that if you ever want to revert back, you have to flash the old kernel back (from my understanding). Also, I dont think anyone has created a method to flash back to the old kernel yet... I need to do some more research, But I would recommend the average user of the nook tablet to not try this just yet... They are making great progress though. Check it out!