Good patterns or apps to use when writing django code that will serve multiple, subtly different sites

I'm heading into working on a project that will be a single codebase that will manage multiple, slightly different sites. I've found a few things, which I'll put in the answers, but I'd like to see if people have other ideas, especially for how to manage t开发者_JAVA技巧he minor form, model, and view differences that crop up.

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I'm hoping for better answers, but I wanted to put these in here in case I don't get them, or to give people looking for the same info the few links I've found. =)

http://www.huyng.com/archives/franchising-running-multiple-sites-from-one-django-codebase-2/394/

and

http://blog.uysrc.com/2011/03/23/serving-multiple-sites-with-django/