I'm not too worried about amazon knowing my reading habits, they track everything i look up on their website anyway and there is a lot more of that. That said the first thing i do when i have bought an azw is download it into my kindleforpc and crossload it into calibre stripping the drm from it. That way i know that whatever happens i have that book available to me in an unencrypted format which i can convert to whichever format i may want or need no matter how the technology changes.