Just saw this announcement at PHP.net: http://www.php.net/archive/2011.php#id2011-08-18-1.
In addition to the fixes/enhancements listed there, it also states, "All PHP users should note that the PHP 5.2 series is NOT supported anymore. All users are strongly encouraged to upgrade to PHP 5.3.7." I don't know if that is old news now, but it's the first time I'd noticed it.