D’oh:

django/contrib/admin/util.py
django/contrib/admindocs/utils.py
django/contrib/comments/views/utils.py
django/contrib/formtools/utils.py
django/contrib/gis/db/backends/util.py
django/contrib/gis/tests/utils.py
django/contrib/localflavor/it/util.py
django/contrib/localflavor/se/utils.py
django/contrib/localflavor/uy/util.py
django/contrib/messages/utils.py
django/core/files/utils.py
django/core/mail/utils.py
django/db/backends/util.py
django/db/utils.py
django/forms/util.py
django/http/utils.py
django/test/utils.py
tests/regressiontests/forms/util.py