Now that Gravatar support is part of the WordPress core adding them into your WordPress theme is easy. Adding them to your comments has been documented. How about adding them to your post titles to highlight the comment author? Within the loop? That’s fairly easy too. Here’s the code:
<?php echo get_avatar( get_the_author_email(), '80' ); ?>
Pretty simple, huh? get_the_author_email outputs the post author’s email and the “80” is the size of the avatar image in pixels (you can change that). How this will look depends on how you use it; where you put it in the theme (it has to be in the loop!) and how you style it.
Want an example? I had to figure this out for an upcoming project so…
Look at that frighteningly intense young man there in black and white. Good grief, it’s me! The author of the post! The code, it works! It works!
Ahem. Excuse me. I get a little excited about these things. Good luck using it in your own theme!
By the way, did you know WordPress has built in email protection from spam bots (read Disguising Your Email)? I didn’t. Neat.
ThemeShaper 
Thanks for good information. But can u tell, where this code I must put?
In a comments loop.
Hi Ian,
I am new to Gravatars. I want to add Gravatars to my blog so that at the bottom of each blog post, the post author’s Gravatar will be displayed along with their description and website. Is there a widget for that? Here is an example of what I am looking for:
http://www.detroitmommies.com/2010/06/rhpl-evening-family-storytime/
If you look at this post, at the bottom you will see the Autors Gravatar, a description of the author and a link to their website. Is there a plug-in or a widget that does this? I have the same theme blog which is the lifestyle theme.
Thanks,
Nice info 🙂
i need this information to add my avatar as author of me. 🙂
Nice tip,thanks