CommenterUserpic
This template tag returns a complete HTML img tag for the current commenter's userpic.
For example:
<img src="http://yourblog.com/userpics/1.jpg" width="100" height="100" />
Example:
    <h2>Recent Commenters</h2>
    <mt:Entries recently_commented_on="10">
        <div class="userpic" style="float: left; padding: 5px;"><$mt:CommenterUserpic$></div>
    </mt:Entries>