Aaron Axelsen

Overrides the <code>wp_notify_moderator</code> function located in pluggable.php. By default, wordpress does not notify a comment author of a moderation 
event. This plugin will look at all users in the blog, and notify anyone who can moderate the plugin, along with the admins and the author 
of that post. This has been tested and does work with WPMU as well.

Post Author Comment Notification

Overrides the wp_notify_moderator function located in pluggable.php.  By default, wordpress does not notify a comment author of a moderation

xieno

XE Author List Widget Plugin displays list of authors. It also displays authors Email avatars.
XE Author List Widget Plugin displays list of authors. It allows to admin number of authors to display. admin can set author avatars image size email.

XE Author List Widget

XE Author List Widget Plugin displays list of authors. It also displays authors Email avatars. XE Author List Widget Plugin displays list of authors.

Post Author Comment Notification vs XE Author List Widget