I applied mkdir.diff, 08-07, patch to my current working copy, added version-added and News entry (with credit to Ray Allen) and added Ray Allen to ACKS. Uploaded as mkdirs.tr.diff

I suspect a complete test should include a linux system, but I copied os.py and test_os.py to my WinXP 3.2a3 installation and in IDLE ran
>>> from test.test_os import test_main as f; f()

The mkdir tests passed, but for what is is worth, 3 others did not:
(I have no interpretation or comment on these ;-)
======================================================================
ERROR: test_CTRL_BREAK_EVENT (test.test_os.Win32KillTests)
----------------------------------------------------------------------
Traceback (most recent call last):
  File "C:\Programs\Python32\lib\test\test_os.py", line 1137, in test_CTRL_BREAK_EVENT
    self._kill_with_event(signal.CTRL_BREAK_EVENT, "CTRL_BREAK_EVENT")
  File "C:\Programs\Python32\lib\test\test_os.py", line 1111, in _kill_with_event
    time.sleep(0.5)
WindowsError: [Error 6] The handle is invalid

======================================================================
ERROR: test_link (test.test_os.LinkTests)
----------------------------------------------------------------------
Traceback (most recent call last):
  File "C:\Programs\Python32\lib\test\test_os.py", line 906, in test_link
    self._test_link(self.file1, self.file2)
  File "C:\Programs\Python32\lib\test\test_os.py", line 901, in _test_link
    os.link(file1, file2)
AttributeError: 'module' object has no attribute 'link'

======================================================================
ERROR: test_link_bytes (test.test_os.LinkTests)
----------------------------------------------------------------------
Traceback (most recent call last):
  File "C:\Programs\Python32\lib\test\test_os.py", line 910, in test_link_bytes
    bytes(self.file2, sys.getfilesystemencoding()))
  File "C:\Programs\Python32\lib\test\test_os.py", line 901, in _test_link
    os.link(file1, file2)
AttributeError: 'module' object has no attribute 'link'