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.

Jake Goldman

This widget selects a limited list of random post authors, weighted towards authors with more published posts. 
Give all of your post authors a chance to be featured in the sidebar, while encouraging more posting and 
rewarding authors who post most frequently.
Easily configure numer of authors (or list all), widget title, display of post count, and display of author 
gravatar.
<h3>Coming soon</h3>
<ol>
<li>Call output by function (no widget support required).</li>
<li>More display configuration options.</li>
</ol>

Weighted Random Authors

This widget selects a limited list of random authors, weighted towards authors with more published posts. Easily configure numer of authors, widget t …

Awesome Authors vs Weighted Random Authors