There are MoinMoin, Pida, PyPy and many other projects using py.test. From the point of view of examples, you can also study your own py.test test suite, which naturally uses many of its functions. Place an order http://bitbucket.org/hpk42/py-trunk and the "testing" subdirectory and, possibly, indicate the problem on the tracker that you want to see in the documents with documents page :)
update: There are currently listed companies and projects that use py.test, see
http://pytest.org/latest/projects.html#projects
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