This week's book giveaway is in the OCPJP forum. We're giving away four copies of OCA/OCP Java SE 7 Programmer I & II Study Guide and have Kathy Sierra & Bert Bates on-line! See this thread for details.
Why bother with a book? Visit www.agilemodeling.com/artifacts for a free, online overview of a wide range of models include the 13 diagrams of the UML (which neither of the above books cover fully, BTW).