mdiamondstone

authorGrid is a sidebar widget that displays the avatar of any author on your blog with at least one published post in grid form. You 
can set how large the avatar should be, how many columns (or rows) you’d like in the grid, and the display title of the widget.

Author Grid

Sidebar widget that displays the avatar of all of the authors on your blog in grid form.

TrueFalse

Lightweight plugin that overrides the default widget “recent comments” in WordPress, adding an avatar display visitors comments and quotes length of 50 characters.
Is a direct descendant of WP_Widget_Recent_Comments.
Example markup that is generated by the plugin(for theming):
<pre><code><ul id="recentcomments">
 <li class="recentcomments">
 <div class="alignleft">
 <img width="32" height="32" class="avatar avatar-32 photo" src="http://0.gravatar.com/...%3D32&amp;r=G" alt="">
 </div>
 UserName: excerpt comment <a href="http://example.com/page/#comment-ID">»</a>
 </li>
 <li class="recentcomments">
 ...
 </li>
</ul>
</code></pre>

WP Recent Comments With Avatars

Adds avatars and announcements comments. Compact code.

Author Grid vs WP Recent Comments With Avatars