use of threading.Thread causes db connection leak

I discovered our webserver was leaking db connections because of the
use of threading.Thread in combination with the Django ORM. Looking
through the Django 1.4 release notes it seems that connection objects
are safe to share among threads. Is there something special that I
need to do to make sure the connections are closed? The background
threads are definitely terminating (they do a calculation and then put
the result in a Queue.Queue)

Some information about our setup:
Hosted on Heroku (Nginx)
Django 1.4
Postgres 9.1.3
psycopg 2.4.3

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