These guys are trying - http://www.kno.com/ http://www.kno.com/ - but I think it's silly to literally copy the physical form factor of a textbook. I think textb

These guys are trying - http://www.kno.com/ http://www.kno.com/ - but I think it's silly to literally copy the physical form factor of a textbook. I think textbooks will not be replaced by devices like this, but stuff like the Khan academy.