Milan Kaneria

This plugin will insert a link in the comment form that will allow the comment author to delete their personal info from it that is stored in a cookie. Only unregistered commenter will be provided with the delete link if they already had a previously posted comment.
Support
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ET Remove Comment Author Info

This plugin allows commenter to remove their comment author details from the comment form.

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.