How to: Enable Faceted Search in Search Server 2008 and SharePoint Server 2007 Search

It has many names; Faceted Search, Refinement UI, Search within Search and it’s a feature that’s frequently requested.  Both Search Server 2008 Express and SharePoint Server 2007 Search can display faceted results with just a little customization work using the samples available on CodePlex here - http://www.codeplex.com/facetedsearch

Facets are implemented and administered as managed properties, so HTML pages, Office documents, SharePoint lists, database tables, web services - in fact, any content source indexed by MOSS can be made available as a facet.

Read the complete post at http://blogs.msdn.com/enterprisesearch/archive/2007/11/24/how-to-enable-faceted-search-in-search-server-2008-and-sharepoint-server-2007-search.aspx