srcoley

This wigetized plugin shows the gravatar and info of the most recently active authors of your blog. The author with the most recent post will be displayed first, the author with the second latest will be displayed second, and so on.
Awesome Authors allows you to select ‘Sticky Authors.’ These authors will be displayed at the front of the list no matter how long ago their latest post was published. Conversely, you can select authors to be ‘Excluded Authors.’ These authors will never be displayed in the list no matter how many posts they have or how recently their last post was published. You can also set a minimum post requirement. If you set this to, let’s say 10, then only authors with 10 or more published posts will be displayed on the Author Bar. Some of the other options include gravatar display size, and how many authors overall to display.

Awesome Authors

This wigetized plugin shows the gravatar and info of the most recently active authors of your blog.

isevcik

Plugin add new widget User Box Widget. Widget shows registered user avatars in a box in similar way 
like facebook like box does. 
You can tune widget with these options:
<ul>
<li>define title of widget box</li>
<li>set number of displayed avatars</li>
<li>choose shape of avatars: circle or rounded rectangle</li>
</ul>
If you have any problems or question contact me on http://www.ivansevcik.cz/user-box

User Box

Very easy to use widget for displaying box with user avatars.



Simple Users Box

Plugin provides a widget for displaying avatars of registered users.

Awesome Authors vs User Box