Last week I bought Born To Run for my Kindle. By the time I finished reading it I had already ordered two hardcover copies as well. I will use one to highlight, dog-ear, and scribble notes in, and the other will be kept pristine so I can enjoy reading it again in the future, or lending it out to friends to encourage them to read books I've found very enjoyable. I do this with a lot of books.
Based on another thread on the board somewhere I picked up Tim Noakes's Lore of Running. I haven't dug into it yet, but I probably will start this holiday weekend. I also just read an article on Sports Illustrated, which is from Ultramarathon by James Shapiro. I can't believe people raced 24hr nonstop on a tiny track.
Article Link: http://sportsillustrated.cnn.com/vault/article/magazine/MAG1123639/1/index.htm