Joomla is a content management system (CMS) for web sites. Current estimates (as of January 14, 2011) are that Joomla powers 2.6% of all web sites. Joomla version 1.x was replaced with Joomla 1.5x several years ago, and the changes were significant. Late on January 10, 2011, version 1.6 was released. This version has some wonderful changes, and many parts of Joomla were re-written from scratch to accomplish these feats. Here are some of the changes.