O’Reilly Press is now offering a small number of titles as print, DRM-free PDF, or both. They’ve got 30 titles where you can choose your medium, and a dozen of those are also available on the Kindle. Interesting comments, including a brief discussion of why electronic books aren’t 90% cheaper than print even though there’s no printing and binding and shipping costs involved, and some discussion of the effectiveness (or lack thereof) of Digital Rights Management.