So if you have your own website with a stand-alone domain name, you may be using Google Apps for Domain to manage services like email, chat, calendars, sites, docs, etc for the domain.
If you have never worked with Google Apps for Domain or you just use the very basic features, check out the post from Lifehacker that walks you through the setup and tells you how to use all the other advanced features like a catch-all address for your domain, updating accounts in bulk and sharing contacts and documents with only your domain.