Just finished viewing a presentation on some of the new Lucene 4 features by Uwe Schindler Flexible Indexing in Lucene 4.
If you haven't been following the development of Lucence and some of the related projects, SOLR, and ElasticSearch, you really need to pay attention. It's just amazing to me the rate of advancement in these projects and the huge impact these projects are making on business and the web in general.
As they say, Search is King, and Lucene is king of open source search.
- Craig