In the April 2008 survey we received responses from 165,719,150 sites. Most of this month's growth of 3.1 million sites is seen in the US, with Google's Blogger service alone adding 1.1 million extra sites.
lighttpd loses a small number of sites this month, but still maintains a significant foothold in our survey with 1.5 million sites. lighttpd is used to serve some of the content for YouTube, Wikipedia and meebo, and is open sourced under the revised BSD license.
Largely due to the growth at Blogger, Google's developer share increases by 0.54% to 6.08% this month, while Apache falls by 0.27% and Microsoft by 0.14%. In absolute terms, this still means that Apache has gained slightly more sites than Google's 1.07 million, while Microsoft gains 847 thousand sites.
While Blogger continues to run a very large number of sites, Google's new App Engine service is unlikely to make much of an impact on our survey in the immediate future. A limit of 10,000 accounts has been put in place during the preview release stage, and each developer can only create a maximum of three applications.
A more detailed list of servers is given here.