Will Nginx Be to Apache What Chrome is to Firefox?
The Netcraft Web Server Survey, which appears each month, is usually viewed as offering the spectacle of a two-player fight between the open source Apache and Microsoft's IIS. Actually, that's giving Microsoft too much credit, since it's never really been a fight: IIS has occasionally tried to claw its way closer to Apache's market share, failed dismally, and then started sinking back again. But there's another story in these graphs.
On Open Enterprise blog.