http://gee.cs.oswego.edu/dl/classes/EDU/oswego/cs/dl/util/concurrent/intro.html
The package mainly consists of implementations of a few interfaces:
Sync-- locks, conditions
Channel-- queues, buffers
Barrier-- multi-party synchronization
SynchronizedVariable-- atomic ints, refs etc
java.util.Collection-- collections
Executor-- replacements for direct use of Thread
