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I agree the change in default behavior here was at least 
questionable, and spent more than a week of my 
own "dealing with consequences" of 2.4 asyncore changes in 
ZODB and Zope.

Assigning to Andrew, since it looks like he made the change 
in question here.  Andrew, why did this change?  How can it 
be improved?

I don't think Tony has mentioned it here, but when 
SpamBayes was first released with Python 2.4, it was a 
disaster because some users found their hard drives literally 
filled with gigabytes of mysterious "warning: unhandled 
exception" messages.