If you have already own the Nook Color ebook reader tablet, there is a overclocking project to leverage its performance without costing more energy. We have known that previously, someone has managed to instal Ubuntu Linux into this puppy. Now this one is yet another new mod to turn the Nook Color into a speedy ebook reader, where the overclocker has managed to boost the processor performance from 800MHz to 950MHz or faster if you want it to be.
The hack and mod is made possible thanks to the installation of custom kernel, where it let you reduce the voltage while increasing the clock speed. Practically, NOOK color can be overclocked to 1GHz in theory. However, it seems there is some kind of compatibility problem when going to that limit.
You can go ahead check out the project at XDA-Developers. Make sure you know what you are doing before going further into the hack and mod.