This week's giveaway is in the EJB and other Java EE Technologies forum. We're giving away four copies of EJB 3 in Action and have Debu Panda, Reza Rahman, Ryan Cuprak, and Michael Remijan on-line! See this thread for details.
We only made minor refinements to our concurrency chapter. Note that relying on areas like this is best suited with a focused and comprehensive resource like the Java 7 Concurrency Cookbook by Fernandez Javier (Packt Publishing , October 2012).
Also, we did make minor changes to the Memory Management chapter as in references, and alike, to the Garbage-First (G1) Collector.