I don't read all of the books I get already. Some I read cover to cover, others I read portions of, use for reference, or just pick out a few key ideas. Other times I change to another topic for a while before I get to the book, and end up reading it years later. I'm not just feeding my short-term reading, I'm building a library.

Also, I specified an open, non-DRM format because that way I could apply software to the problem: text summarization tools, staged memory training, and/or just copying sections out manually into summary documents.