Hi Martin,
unfortunately I haven't found time to work on a C based
winerror module.
Here's a generator and the generated Python module
which defines the interface. This can then later be
replaced by  a more efficient C implementation.

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As discussed before, I am uncomfortable with a lookup
object, instead of just two dicts or dict-like objects: it's
inconsistent with the errno module, and I don't see the need
for it.
Also, can you please provide documentation?

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It's a new module, so it may also come with a new interface.
Note that there's not much difference between the errno
module and winerror, except that you can't write
winerror.ERROR, but have to do one more indirection:
winerror.winerror.ERROR.
The reason for having a lookup object is that the number of
error symbols is huge and you'd ideally only want those
symbols being loaded into the process that actually need
(typically only a few). The C implementation of the lookup
object will make this possible by storing the data in a
static C array.
I will add documentation for the module based on the errno
module documentation, but not before next week - no time. I
still think that the module should go in before beta1 is
released.

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This will have to wait until Python 2.6... (see python-dev
for discussion).

Marc-Andre, what should we do about this patch?

The winerror module should really be coded in C. Otherwise you don't
benefit from the lookup object approach.
The files I uploaded only server as basis for such a C module. Would be
great if you could find someone to write such a module - preferably
using a generator that creates it from the header files.
I'm not interested in this anymore, so feel free to drop the whole idea.

Ok rejecting it.

pywin32 has a 'winerror' module, which is (basically) a h2py generated
module from the same header (although initially generated roughly a
decade ago and hand-tweaked since then).  Its unfortunate pywin32 still
hasn't adopted a package approach, but it would be nice to find
something compatible with pywin32 should a winerror module ever be adopted.