Summary of webservers being used by the alexa top 100: http://royal.pingdom.com/2008/03/18/apache-dominates-the-top-100-websites-iis-still-far-behind/ http://ro

Summary of webservers being used by the alexa top 100: http://royal.pingdom.com/2008/03/18/apache-dominates-the-top-100-websites-iis-still-far-behind/ http://royal.pingdom.com/2008/03/18/apache-dominates-the-top... Plentyoffish.com is famous for being built and scaled by one man on ASP. I'm sure Microsoft.com and their other properties are primarily on their tech stack(hotmail, msn, etc.) I'd bet that every site that has experienced any scaling concerns uses a combination of technologies. For example, much of facebook is actually written in C++.