The Joomla! community is pleased to announce the immediate availability of Joomla! 1.5.3 [Vahi]. This release is earlier than scheduled in order to correct a database name validation error introduced in 1.5.2. It has been a month since Joomla! 1.5.2 was released on March 23, 2008. The goal is to provide regular, frequent updates to the Joomla! end user community containing the latest bug fixes and minor enhancements.

http://www.joomla.org/content/view/4852/1/