Threads, Threads, Threads

A topic I never get sick of threads. Javaworld series:
http://www.javaworld.com/javaworld/jw-08-2002/jw-0802-java101_p.html

OptimizeIt Suite (Thread Debugger):
http://www.optimizeit.com/products/threaddebugger/overview.html

My favourite author on the subject (Doug Lea):
http://gee.cs.oswego.edu/dl/