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These are old bugs in complex_pow() and friends.  Please 
give current CVS a try!  Changes made in

Objects/complexobject.c; new revision: 2.55:

1. Raising 0 to a negative power isn't a range error, it's 
a domain error, so changed c_pow() to set errno to EDOM in
that case instead of ERANGE.

2. Changed complex_pow() to:

A. Use the Py_ADJUST_ERANGE2 macro to try to clear errno of
a spurious ERANGE error due to underflow in the libm pow()
called by c_pow().

B. Produce different exceptions depending on the errno
value:

i) For errno==EDOM, raise ZeroDivisionError instead of
ValueError.  This is for consistency with the non-complex 
cases 0.0**-2 and 0**-2 and 0L**-2.

ii) For errno==ERANGE, raise OverflowError.