Like "digital copies" with DVDs or BluRay, when will books come with a digital code for e-readers?
Technology is progressing so fast, there will come a day when e-readers are obsolete and replaced by something else. It is for this reason, I would like to purchase a hard-copy of a book, and receive a digital code that I can enter into my nook/kindle/etc. and have that digital copy wherever I go. If I purchase JUST the digital copy, that money is wasted when the technology becomes old.