Apache is king

The Apache server hosts a whopping 71.49% of all web sites. Of the 15.3 million Web sites that were part of the Security Space Web Server Survey of August 2004, almost 11 million were using the Apache server while Microsoft was a distant second with a 21.9% share.
Also .com domains seem to be far more popular than the other options like .net, .edu or the country specific options like .de, .uk or the Indian .in.
48.11 percent sites were .com while .de was second with 7.45%.
For more results, check out the Serverwatch site