Magento introduces Solr in new Enterprise Edition 1.8
Magento’s Enterprise Edition 1.8 is released. One interesting feature it introduces is “Solr” for full text searching. Solr is open source, very fast full text search engine from Apache project. More Solr features include hit highlighting, clustering, db integration, faceted search, and rich document (e.g., Word, PDF) handling.
Solr is very similar to SPHINX. You can find more about Solr at http://lucene.apache.org/solr/ and to find more excited features of new Magento see http://www.magentocommerce.com/.
We have implemented this integration, and we have also created custom extensions to include more in Solr than what Magento does out of the box.
Take a look at what we have done (and probably more important, how we did it) here: http://www.summasolutions.net/blogposts/magento-apache-solr-integration