Kas Thomas at CMS Watch – Solr heads for an even sunnier future:

"Anyone who's been watching the search space for a while knows that Apache Solr -- the popular open-source search server built on Lucene -- is the elephant in the room for a great many product-selection teams these days. It may be an exaggeration to say that most product-selection discussions begin with "What about Solr?" But not by much.

The release of Solr 1.4 will no doubt only intensify debates over the virtues of build versus buy and open source versus vendor lock."