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Neil, can you make some time to eyeball this (patch.txt)?  If 
not, please assign to Fred.  The Python -uall suite passes in 
debug and release builds.

I just ran the -all Zope3 test suite in a debug buld, and that 
passes as well as it does with Python 2.3.4 on Windows, but 
I see many thousands of lines like:

Exception exceptions.KeyError: <weakref at 104EA620; dead> 
in <function remove at 0x01595560> ignored

So there's something still wrong here.  I'm not sure who's 
writing those msgs; I expect it's in the guts of gc, when 
invoking delayed weakref callbacks, and triggered by the 
weak dictionary implementations (which haven't changed).