Damien Seguy has posted this month's PHP statistics (for November 2007):

Here are the monthly highlight :

• PHP 5 still vigorous, up to 26%
• PHP 4.4.7 is the last growing PHP 4 version
• PHP 5.2 will take over PHP 4.3 in the next months

You can check out the full stats here as well as the evolution stats here.