Kindle Fire and Android sound promising.
Yeah, there is a “singleclick” hack that will make the Kindle an Android device. This means that for $200 you have a pretty respectable Android tablet - and then can load your tablet with Kindle software, as well as Nook software; plus everything else that Android has.
The Nook apparently locked the bootloader - which is a big no-no to many people (like me). And, the RUMOR (I haven’t ocnfirmed this) is that the new Color Nook won’t let you boot off the SD card either.
Whereas, the less hardware boosted Kindle Fire seems wide open to throwing Android at it.