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The recent updates to bsddb (r63207, r63210 and r63218) needs to
forward-ported to the py3k branch.
At first glance, here is the things that needs to be done in the test suite:
 - Change the import:
 from test_all import ...
 into a relative import:
 from .test_all import ...
 - Replace code incompatible with 3.0, such as changing
 ``dict.has_key(key)`` to ``key in dict``.
 - Change str literals to bytes literals where appropriate.
 - Optional: change code like ``type([])`` or ``type(())`` to 
 respectively ``list`` and ``tuple``.
 - Change print statements into print() calls.
 - Change ``x != None`` to ``x is not None``.
In the modules:
 - Change PyInt__* to PyLong_*.
 - Update the PyTypeObject declaration:
 statichere PyTypeObject DB_Type = {
 PyObject_HEAD_INIT(NULL)
 0, /*ob_size*/
 "DB", /*tp_name*/
 sizeof(DBObject), /*tp_basicsize*/
 ...
 to:
 static PyTypeObject DB_Type = {
 PyVarObject_HEAD_INIT(NULL, 0)
 "DB", /*tp_name*/
 sizeof(DBObject), /*tp_basicsize*/
 ...
 - Update module init declaration:
 DL_EXPORT(void) init_bsddb(void)
 {
 ...
 to:
 PyMODINIT_FUNC init_bsddb(void)
 {
 ...
 - Remove Py_TPFLAGS_HAVE_WEAKREFS.
 - Change PyString_* calls to PyUnicode_* where appropriate.
There probably other things that I missed, but that should give you a
good start.

I believe Jesus wants to do this is such a way that bsddb.h and _bsddb.c
are a single code base with #ifdef's that compiles on 2.x and 3.x at once.

Yes. My idea is to port the python code as-is, using "2to3", and update
the C code with conditional compilation, to keep a single codebase.
I'm having issues with the compatibility. In particular, my code has the
following line:
"""
staticforward PyTypeObject DB_Type, DBCursor_Type, DBEnv_Type,
DBTxn_Type, DBLock_Type;
"""
Compiling this code fails with the following error (when compiling
against Python 3.0):
"""
Modules/_bsddb.c:241: error: expected '=', ',', ';', 'asm' or
'__attribute__' before 'PyTypeObject'
"""
Compiling the same code against Python 2.x, works.
Ideas welcomed :).

FWIW, I bumped the version of Berkeley DB being used on Windows from 
4.4.20 to 4.7.25 in r64555 (trunk). I blocked this from being merged 
to py3k. This block should be removed once bsddb has been updated.

bsddb is officially dropped in Python 3.0. Too bad :(. I close this issue.
bsddb supports Python 3.0 via a separate project, downloadable from PYPI.