Now, the service is available on the iPad, and therefore likely to be a whole lot more useful. Kno has inked deals with many of the major textbook publishers and you can buy their wares directly from within the app, often at a big discount.
The app lets you choose from 70,000 textbooks, and you can search, zoom in on pictures, add sticky notes and highlight text. You can also share passages with friends or fellow students via FaceBook or Twitter.
What's more, you can load the apps with your own PDFs.
Kno looks pretty good. I have been struggling to use my iPad in my twice-weekly Spanish classes. The tiny desk-chair tabletop thingy is angled so my iPad can slide off easily when its piled up along with my paper textbook and paper handouts. If my textbook was available in Kno, I'd use it in an instant. It would gather what I currently do in several apps all into one place.
Kno is available free, currently only in the U.S App Store.
Kno product page [Kno.com]
Kno app page [iTunes]
source: Gadget Lab