Running Fast & Injury Free
When I first got turned onto the minimalist running regime, this e-book (yeah it sounds cheesy) was one of the most influential pieces of literature I found. I don't agree with every single point, but I identified with so many things in this book (his take on posture, his aversion to static stretching, and his take on today's shoes) that it was like things finally fell into place.
The actual website is abysmal and looks like it was designed by a 5th grader on Geocities, and the e-book formatting itself is nothing to brag about. However the content is priceless. I got this thing printed out and sprial bound, and you might end up doing the same: http://www.scribd.com/doc/13695/Gordon-Piries-Running-Fast-and-Injury-Free