Haystack 1.0.0-final has been released (via the packages at PyPi or GitHub).

The goal of Haystack is to provide modular search for Django. This means pluggable backends (Solr, Whoosh & Xapian currently), a reusable app architecture, the ability to add search to third-party modules without modifying their sources and a flexible codebase with many points of extension. The crown jewel is the SearchQuerySet, which provides a QuerySet-like interface to your search index.

Overview of using Haystack for search in Django applications.