Very cool... Xapian, Sphinx and Hyper Estraier support should be coming soon:
http://haystacksearch.org/docs/backend_support.html
Re:Haystack - Search for Django
by thomaspaine on Thursday May 28, 2009 @02:32PM
(#630764)
I'm not so sure about Sphinx support coming anytime soon: http://github.com/toastdriven/django-haystack/issues/labels/...
From my experience using Sphinx, it would be a non-trivial task to make it work with Haystack. There's the django-sphinx project which is what I currently use, but I remember getting started with it was kind of a pain. It's speed is really nice though.
It currently support Solr really well, and Whoosh (Pure Python) decently.