If you are concerned with your books being DRM'd and Amazon disappearing (as corporate megaliths do from time to time cough SGI, Sun, DEC cough), I would sugges

If you are concerned with your books being DRM'd and Amazon disappearing (as corporate megaliths do from time to time cough SGI, Sun, DEC cough), I would suggest downloading them onto your 'real' computer, saving off the files, and then unwrapping the DRM.