I've started a very rudimentary TextMate language bundle for Django templates (http://djangoproject.com). It's just a bunch of snippets for tab-completion of the standard template tags and a very basic language definition for syntax coloring.
I'm new to tmbundles, so everything is extremely basic and naive right now, but if anybody out there is editing Django templates and using TextMate, feel free to give it a whirl and let me know what does and doesn't work. Suggestions or additions are welcome.
Grab the bundle here: http://media.wilsonminer.com/images/django/Django.tmbundle.zip