A few hours ago, 11th release of PHP 5.2, 5.2.10 was released to the world. This, as most past 5.2.X releases has been largely focused on bug fixing with quite a few obscure crashes and memory leaks being addressed, in addition to a single security fix in the exif_read_data() function. All in all there are over 100 individual bug fixes in this release and most 5.2.X and definitely all 4.X users should consider upgrading to this version.
The sources and windows binaries for this release can be found at
http://www.php.net/downloads.php and the detailed changelog itemizing all of the changes can be seen
here.