How To Get a Gravatar
An “avatar” is an image that represents you online—a little picture that appears next to your name when you interact with websites.
A Gravatar is a Globally Recognized Avatar. You create your profile just once, and then when you participate in any Gravatar-enabled site, your Gravatar image will automatically follow you there.
If you want the maximum from your blogging efforts (assuming you blog because you want to improve your search results), this is a Must-Do for your SEO checklist.