Start exposing your hidden data with Blacklight!
Faceted browsing with Solr and Ruby on Rails
Blacklight is an open source OPAC (online public access catalog). That means libraries (or anyone else) can use it to allow people to search and browse their collections online. Blacklight uses Solr to index and search, and it has a highly configurable Ruby on Rails front-end. Currently, Blacklight can index, search, and provide faceted browsing for MaRC records and several kinds of XML documents, including TEI, EAD, and GDMS. Blacklight was developed at the University of Virginia Library and is made public under an Apache 2.0 license.
Try using Blacklight in a UVA Library experimental interface. Download the source code. And join the mailing list to stay updated on new developments and releases.