if u r using django, shameless plug here, http://tidbids.posterous.com/saas-with-django-and-postgresql-schemas http://tidbids.posterous.com/saas-with-django-and

if u r using django, shameless plug here, http://tidbids.posterous.com/saas-with-django-and-postgresql-schemas http://tidbids.posterous.com/saas-with-django-and-postgresql... may help a bit