According to the latest post on the main PHP site, the latest release of the PHP 5 series - PHP 5.2.4 has been posted for public consumption.

The PHP development team would like to announce the immediate availability of PHP 5.2.4. This release focuses on improving the stability of the PHP 5.2.X branch with over 120 various bug fixes in addition to a resolving several low priority security bugs. All users of PHP are encouraged to upgrade to this release.

Check out the release announcement for complete details on what's been updated or just head straight to the downloads page to grab this latest release.