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I worked up a simple example of using the external processing module 
(0.52) for a friend at work today. I noticed some cases where it raised 
exceptions during exit. Not all the time, but not infrequently either. 
This evening I tweaked it for the 2.6 multiprocessing module's API and 
tried it out. I ran it in a large loop:
 for i in $(range 500) ; do
 echo '!'$i
 python test_proc.py
 end | egrep '!'
Most of the time all I see are the '!' lines from the echo command. 
Every once in awhile I see a traceback though. For example:
Exception in thread QueueFeederThread (most likely raised during 
interpreter shutdown):
Traceback (most recent call last):
 File "/Users/skip/local/lib/python2.7/threading.py", line 522, in 
__bootstrap_inner
 File "/Users/skip/local/lib/python2.7/threading.py", line 477, in run
 File "/Users/skip/local/lib/python2.7/multiprocessing/queues.py", line 
233, in _feed
<type 'exceptions.TypeError'>: 'NoneType' object is not callable
This occurred once in approximately 1500 runs of the script (three times 
through the above shell loop). The script used to trigger this 
exception is attached.