Doug Lea on the Art of Multiprocessor Programming

Doug Lea on Concurrency-Interest:

This is by far the best source for explaining the ideas and algorithms underlying java.util.concurrent -- the vast majority of them, plus some others, including a few that may someday appear. It also uses Java / java.util.concurrent to illustrate most concepts. I strongly recommended it.

Strong praise coming from a distinguished source like Doug Lea, I'd say.