In a new submission from Damien Seguy:

Nexen.net just published the PHP stats for December. The stats includes versions adoption, PHP 5 migration, PHP penetration by country.

During December, PHP 5 went up and is forecasted to reach PHP 3 level during january.

• December 2004 Statistics
• November 2004 Statistics
• October 2004 Statistics

I have to admit, it's a little discouraging to see that PHP 5 hasn't been adopted more in the community. I know there is lots of talk about how much more feature-rich it is and how it can really help improve a site's performance, but I think people are still pretty hesitant to make the leap...