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As part of my summer of code project I have back-ported a new patch that got into Drupal HEAD which allows contributed modules to interact with the Drupal core search module's result ranking. I wrote an implementation of hook_ranking() for the fivestar module that makes nodes with higher average ratings float to the top of search results. The patch includes a new test file that provides simpletest coverage for the additions.
- Requires search_ranking module: http://drupal.org/project/search_ranking