1. Use Open Source, and Lots of It: Anything that drives costs down is a win, and open source is the best and most cost-effective tool you'll find in most cases for infrastructure. Take any given adult site and use Netcraft to query the site and see what its hosting infrastructure is. You'll probably find that it's a typical LAMP stack, and almost certainly not a Windows Server environment. And when we say LAMP, that means lots and lots of Perl.