Good thread pool module

[David Hirschfield]

There isn't a thread pool module in the standard library, but I'm sure 
many have been written by people in the python community.
Anyone have a favorite? Is there one particular implementation that's 
recommended?

Not looking for anything fancy, just something that lets me queue up 
tasks to be performed by a pool of threads and then retrieve results 
when the tasks complete.

Thanks,
-Dave

-- 
Presenting:
mediocre nebula.