(Take 2, first one got caught up in another thread.)
Acts_as_indexed is a plugin for Ruby on Rails. With only a few simple setup steps, and no external dependencies, it is designed to get you up and running with indexed full-text search in as small a time as possible.
The pure Ruby implementation of this full-text search makes for a tool that is totally portable, and suitable for almost any application requiring such capabilities.
Search queries support many standard boolean operators, namely exclusion of a term through the use of ’-' and the matching of phrases through the use of quotation marks.
Full details, install and documentation: http://douglasfshearer.com/blog/rails-plugin-acts_as_indexed
Feedback is most definitely appreciated.