Screaming Penguin - Source Does Matter

If you have not seen/used Lucene yet you need to see what its all about. Lucene is the Apache Software Foundations Jakarta project Java search engine. It is, like most Apache/Jakarta projects, an excellent program.

Lucene is in use on many web sites as the search engine technology. Lucene is a Java API for indexing and retrieving text. You do have to build whatever you use yourself via the API, but its very straightforward and very capable (I am working on a Lucene search engine for TotSP, it will be here one of these days).

The linked Oreilly series on Lucene is about the basics and about then improving indexing performance. Checkit --->.   Advanced Text Indexing with Lucene: Oreilly