The number of websites present as on November 13, 2007, is over 5 billion. That is not including websites such as myspace pages, Google pages, or other branches off of websites.The web has grown by 3.14 million sites over the past month(June 08), with Apache web servers increasing by 2.2 million and Microsoft IIS by 1.4 million.
In the case of webserver strong growth is seen in lighttpd, which nearly doubles its total this month, rising from 1.5 million to 2.9 million and increasing its market share to 1.68%. (lighttpd powers several popular Web 2.0 sites like YouTube, wikipedia and meebo. Its high speed io-infrastructure allows them to scale several times better with the same hardware than with alternative web-servers.).lighttpd has overtaken nginx 9nginx [engine x] is a HTTP server and mail proxy server).
Total Sites Across All Domains August 1995 – July 2008
For more information goto netcraft.