Yesterday saw the release of the two latest versions of PHP in both the 5.2.x and 5.3.x series - 5.2.15 and 5.3.4.
Here's a bit from each release announcement.
For 5.2.15:
The PHP development team would like to announce the immediate availability of PHP 5.2.15.
This release marks the end of support for PHP 5.2. All users of PHP 5.2 are encouraged to upgrade to PHP 5.3.
This release focuses on improving the security and stability of the PHP 5.2.x branch with a small number, of predominately security fixes.
For 5.3.4: