From the beginning, the Zope Catalog has provided Plone with out-of-the-box content search, an important feature not found in all open source content management systems. However, search engine technology has been racing ahead and user expectations of what search should do have been changing. At the same time, search engines have gone from premium enterprise product to cheap commondity. The most important search engine worth considering these days is also open source: Lucene/Solr. Several add-on products exist that integrate Solr with Plone, and interest in this technology is growing. What does Solr bring to Plone? Should Solr become part of Plone core?