wphobby

Main Features:
<ol>
<li>List comment subscriptions email, post name, date.</li>
<li>Ban or Active the subscribers.</li>
<li>Modify email notification subject, body, footer by tags.</li>
<li>Modify email styles, include body background, text color and footer background.</li>
<li>Change the display text on the end of comment area.</li>
</ol>
More info:
<ul>
<li><a href="http://plugins.wp-coder.net/purchase/comment-notice/" rel="nofollow ugc">Leave a comment</a></li>
</ul>

Comment Notice

The main function of this plugin is to display a subscription option on the end of the comment area, so they can be noticed when there are new commen …

Anas Mir

If you want more subscribers then you should place subscription box to the correct place. This plugin adds 
Feedburner Subscription Form at the end of your post content.
<ol>
<li>You can change your Feedburner feed</li>
<li>You can apply different CSS to Subscription Form Button according to your Blog theme</li>
<li>Very Easy to implement.</li>
<li>Just 2 step Process.</li>
</ol>

WP Subscriber Form

Adds Feedburner Subscription Form at the end of post content.

Comment Notice vs WP Subscriber Form