Scrum and XP from the Trenches is now available on InfoQ, with forwards by Mike Cohn and Jeff Sutherland :o)
The printed version costs $22.95, the online version is free but requires registration on InfoQ. My older PDF version is hereby deprecated, so if you have any links please update to the InfoQ version!
Registration at InfoQ is simple and quick, I can strongly recommend it. InfoQ is an excellent site with new and interesting content added every day, and smart personalization features. The checkboxes to the left let you instantly filter the content to match your tastes.