The latest PHP stats were just released:
PHP 4.4.x show impressive growth during last month, taking scores of web sites from PHP 4.3.11 and 4.3.10. Users are migrating in spite of BC break.
PHP 5.x rises again, almost reaching 5%, following the trend of the previous monthes. PHP 5.1, published late during the month, had no time to have impact.
PHP keep its level of usage even with complex architectures : domains covering 2 or more IPs are even showing a slightly higher usage of PHP : + 1% to 38% of total.

New this month: the first graphs of evolution since June 2005.

This month : http://www.nexen.net/interview/index.php?id=53

Evolution graph : http://www.nexen.net/interview/index.php?id=54