Plugin: Notification Disabler
Disable notification emails about new and/or moderated comments, pingbacks, and/or trackbacks en masse or on an individual author basis.
Details can be found at the plugin's homepage:
All of my plugins can be found at:
Granted, this plugin/hack may only be of use to a limited number of people, most likely in a multi-author blog where some authors prefer to have e-mail notifications sent to them while others don't.
The addition of four lines to the WP core are necessary for this plugin to work. Those are noted via a WordPress feature request, bug 761 at the WP bug tracker site and also at the plugin's homepage.