@Martin: It looks like the _overlapped module is not more compiled on Windows.

http://buildbot.python.org/all/builders/x86%20Windows%20Server%202008%20%5BSB%5D%203.x/builds/2032/steps/test/logs/stdio

test test_asyncio crashed -- Traceback (most recent call last):
  File "E:\home\cpython\buildslave\x86\3.x.snakebite-win2k8r2sp1-x86\build\lib\asyncio\__init__.py", line 16, in <module>
    from . import _overlapped
ImportError: cannot import name '_overlapped'

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "../lib/test/regrtest.py", line 1278, in runtest_inner
    test_runner()
  File "E:\home\cpython\buildslave\x86\3.x.snakebite-win2k8r2sp1-x86\build\lib\test\test_asyncio\__init__.py", line 31, in test_main
    run_unittest(suite())
  File "E:\home\cpython\buildslave\x86\3.x.snakebite-win2k8r2sp1-x86\build\lib\test\test_asyncio\__init__.py", line 21, in suite
    __import__(mod_name)
  File "E:\home\cpython\buildslave\x86\3.x.snakebite-win2k8r2sp1-x86\build\lib\test\test_asyncio\test_base_events.py", line 11, in <module>
    from asyncio import base_events
  File "E:\home\cpython\buildslave\x86\3.x.snakebite-win2k8r2sp1-x86\build\lib\asyncio\__init__.py", line 18, in <module>
    import _overlapped  # Will also be exported.
ImportError: No module named '_overlapped'