As Matt Asay reports, the LinkedIn social network has just upgraded its people search features, based on the open source search project
Lucene. And,
as Ars Technica discussed in June, MySpace recently updated its search features using Lucene as well --including making contributions to Lucene. OStatic's own search features are powered by Lucene, and many leaders of web sites, blogs and web applications should look into this extremely powerful open source information retrieval engine.