django-tagging registering

I have, in my code:

import tagging

class Entity(models.Model):

    ...

tagging.register(Entity)

I'm getting an error. So far as I can tell, this is the only time tagging.register() is called, although I do call admin.site.register(Entity). Any ideas how I might be making a redundant request? If this is happening because the file is being imported more than once, what is an appropriate way to guarantee that Entity is only registered once?

AlreadyRegistered at /

 The model 'Entity' has already been registered.

Request Method:	GET
Request URL:	http://linux:8000/
Exception Type:	AlreadyRegistered
Exception Value:	The model 'Entity' has already been registered.
Exception Location:	/usr/local/lib/python2.6/dist-packages/django_tagging-0.3.1-py2.6.egg/tagging/__init__.py in register, line 39
Python Executable:	/usr/bin/python
Python Version:	2.6.5
Python Path:	['/home/jonathan/directory', '/usr/local/lib/python2.6/dist-packages/pip-0.6.3-py2.6.egg', '/home/jonathan/store/src/satchmo/satchmo/apps', '/usr/local/lib/python2.6/dist-packages/django_threaded_multihost-1.3_3-py2.6.egg', '/usr/local/lib/python2.6/dist-packages/django_signals_ahoy-0.1_1-py2.6.egg', '/usr/local/lib/python2.6/dist-packages/django_tagging-0.3.1-py2.6.egg', '/usr/lib/python2.6', '/usr/lib/python2.6/plat-linux2', '/usr/lib/python2.6/lib-tk', '/usr/lib/python2.6/lib-old', '/usr/lib/python2.6/lib-dynload', '/usr/lib/python2.6/dist-packages', '/usr/lib/python2.6/dist-packages/PIL', '/usr/lib/python2.6/dist-packages/gst-0.10', '/usr/lib/pymodules/python2.6', '/usr/lib/python2.6/dist-packages/gtk-2.0', '/usr/lib/pymodules/python2.6/gtk-2.0', '/usr/local/lib/python2.6/dist-packages']
Server time:	Wed, 23 Jun 2010 10:46:07 -0500

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