A new article was posted by Fredrik Lundh (effbot) today, entitled Thread Synchronization Mechanisms - it's all around Python threads/locks/etc, and really an excellent read. Remember though boys and girls - threads are cool, fun and an easy way of gaining paralleism inside of your applications but won't properly handle multi-core/CPU load management. For that you need something else (cough fork exec cough).
In any case, if you are new to Python (or threading) please read Fredrik's Article. If you're looks for little examples/information, check out:
- PDF - Tutorial on Threads Programming with Python
- Basic Threading in Python
- Understanding Threading in Python
- WikiBooks: Python Programming/Threading