PHP Versions in the Wild
Damien Seguy from Nexen just sent some interesting statistics on PHP Versions in Use in August 2006. I've ranted before about the use of obsolete, unsupported software way past its expiration date, but it's nice to see PHP 5 adoption continuing to grow (nearly 10% of all servers running PHP, with PHP 6 on the way) and PHP 4.4 poised to overtake all other versions as the most used.
Perhaps the most useful piece of information for PHP developers is that targeting the feature set of PHP 4.3.9 will produce software that runs on three out of four servers surveyed. If backwards compatibility is important to you, that's good to know.