“´These instructions are the rather verbose, but hopefully easy enough to follow, steps to build a new Linux server using Varnish, Nginx, W3 Total Cache, and WordPress, to build a WordPress blog on a Amazon Micro server (or equivalent), all costing under $15 a month, capable of sustaining 10 million hits per day, as measured by blitz.io.”

http://www.ewanleith.com/blog/900/10-million-hits-a-day-with-wordpress-using-a-15-server