According to the latest Netcraft surey,
http://news.netcraft.com/archives/2008/01/28/january_2008_web_server_survey.html

http://news.netcraft.com/archives/2008/01/28/january_2008_web_server_survey.html
There is also good growth for LiteSpeed, a commercial web server designed as a high-performance drop-in replacement for Apache, which passes 400,000 hostnames this month (partly due to its use by blogging provider WordPress.com.