After completing this tutorial, if you have followed the previous tutorial AWS Ubuntu 12.04 LTS with Nginx and WordPress, you will have a WordPress site as fast, possibly faster than what many hosts charge $30 per month for. You will also be able to host an unlimited number of sites on your personal optimized Nginx server configuration.

Not just WordPress, but most PHP back platforms including Drupal, Magento and many others!

WP Engine, a well known WordPress hosting company, charges $249.00 per month for 25 sites using their Nginx configuration. As of this writing, WP Engine does not publicly disclose their pricing for the unlimited site service this tutorial will give you.

AND!!! If you configure your system using an Amazon EC2 micro-instance and micro database, then you may qualify for the hosting plan free for one year, under the Amazon Free Tier Plan.

Before you start, test your site at tools.pingdom.com and note your stats. They are about to significantly improve

http://www.websitescloudhost.com/ubuntu-nginx-aws-ec2-rds-wordpress-ready-server-for-multiple-domains/