http://www.weberinternetmarketing.com/web-site-hosting/ Here is how to easily add an addon domain in your cPanel hosting such as with HostGator. With it you can host unlimited domains with just one hosting account. It's easy to do and from the outside, including the search engines, there is no difference than having multiple shared hosting accounts. From an SEO point of view, addons are no less or more effective than multiple shared hosts.