Ice Cream Sandwich is to me a huge upgrade over Gingerbread on a tablet. The Kindle Fire and the Nook Tablet are both based on Android 2.3. That means you don’t get all the tablet specific goodies that come with ICS. Beyond that you are also limited by what Amazon and Barnes and Nobles want you to do on “their” tablet. That’s where the beauty of the developer community comes into play.
Hacking devices is something I found that I love to do. Whether it is my own, or someone else’s, I love taking a device and making it do what I want it to do, not what the company that made it wants to force me to do with it. If you have a Nook Tablet and want to break out of your B&N box, then CyanogenMod has the answer you are looking for.
A CM9 alpha ROM was just released for the Nook Tablet. Like you should probably know about the fact that it is labeled as an alpha version, there are some things that work, and some things that don’t. From my experience however, a CM9 alpha is still pretty close to being complete by the time they release it for your consumption. The things that are listed as not working include: microphone, bluetooth, hw composition, hw video decoding, and the FM radio. If you are a brave soul, head on over to XDA and see how you can install CM9 alpha 0.[XDA]