Interesting comparison of eReaders, but the big question is, when are textbook publishers going to open up the etext market in a compatible way? My prediction is...too late to matter. Free, open source textbooks like the ck12.org Flexbooks ("mashable" and all!) will soon completely disrupt the textbook market, and the big publishers, who have essentially ignored the market demand, will be left scrambling to offer $10 a pop text downloads. This may also cause a little friction as teachers who have long been enamored with their specific text series will have to let go and take up the new tools of open source, but who can really argue against innovative, standards-aligned, and FREE?