Eric Snow added the comment:

Also missing a pure-Python implementation:

collections.defaultdict (relatively trivial)
collections.deque

In the spirit of what Brett said, I found that PyPy has an implementation 
already:

  https://bitbucket.org/pypy/pypy/src/default/lib_pypy/_collections.py

Jython and IronPython do not have pure Python implentations:
  http://hg.python.org/jython/file/default/src/org/python/modules/_collections
  http://ironpython.codeplex.com/SourceControl/changeset/view/99885#1091023

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nosy: +eric.snow

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