Django.vim is a project mainly written in Vim Script, it's free.
Syntax highlighting for Django templates
This is a mirror of http://www.vim.org/scripts/script.php?script_id=1487
Type ":setfiletype htmldjango" from within Vim to select highlighting for Django HTML templates. If you desire Django template highlighting but not HTML highlighting, type ":setfiletype django" instead. Items highlighted include template tags, built-in filters, arguments and comments.
(N.B. For Vim 7.1 and later you shouldn't need the additional htmldjango.vim file.)