Yup, "PMD Applied", my new book on PMD, is in stock and shipping! It's got a survey of open source Java code analysis tools, chapters on writing your own rules, notes on the IDE plugins for PMD, and much more.
Some committers should already have received their copies, and preorders have been shipped out as well. You can read more about "PMD Applied" (the example code, updates, table of contents, and so forth) at the web site or you can just jump right to the Centennial Books order page.
Enjoy, and thanks for supporting PMD!