Bernhard Kau

This plugin enables blog admins and editors to manage the notification of incoming comments. As WordPress only has the option to notify on every comment, the email account of the admin may recieve many email each day. Notification is also limited to the admin only, so only the admin user will receive an email for incoming comments.
Using the plugin you can subscribe to a RSS feed that contains even comments that has to be moderated. Every feed entry has the links to delete a comment, mark a comment as spam or approve a comment, if the comment has to be moderated. If a comment has been marked as spam, it will no longer appear in the feed.
A list of all of my plugins can be found on the <a href="http://kau-boys.de/wordpress-plugins?lang=en" title="WordPress Plugins" rel="nofollow ugc">WordPress Plugin page</a> on my blog <a href="http://kau-boys.de" rel="nofollow ugc">kau-boys.de</a>.

Kau-Boy's Comment Notification

This plugin enables blog admins and editors to manage the notification of incoming comments. It offers a special RSS feed with all comments, including …

AppJetty

Live comment notification plugin can enable the admin to install a live notification toaster to notify all online customers whenever any comment is made by any online customer.
<ol>
<li>We can have live notification toaster if any user will comment on any content of blog.</li>
<li>Comment moderation must be off to work this plugin well.</li>
<li>If moderation is on then we can have only notification from registered user’s comments.</li>
<li>We can select post type for which we want this notification to work.</li>
<li>We can have multiple comments if comments are posted on multiple posts.</li>
<li>This plugin tracks IP of posted comment and according to it,gives notification.</li>
<li>There is setting in admin,if they want notification open for all users OR only authors.</li>
<li>If they select only authors,then if any comment posted on logged in user’s article,then they will receive notification.</li>
</ol>

Live Comment Notification Toaster

This plugin can enable the admin to install a live notification toaster to notify all online users whenever any comment is made by any online user.

Kau-Boy's Comment Notification vs Live Comment Notification Toaster