O'Reilly User Group is free books for review. With this opportunity Puerto Rico Python Interest Group members can complete reviews of any book in their catalog. PRPIG is standing member in the program, which means if you're a member of PRPIG, you can participate right now!
Not a member? Simply join the PRPIG Google+ Community or like the PRPIG Facebook Page.
Leave me a comment if you would like to find out more information about this opportunity. I look forward to participating myself. I'll let you know how it works out.