This wordpress plugin gives users the option to subscribe to your PHPList newsletter when adding comments to your blog. It requires PHPLIST newsletter manager to work.
It adds a checkbox with customizable text which gives the user the option of automatically being subscribed to your PHPLIST managed newsletter. This integration provides another channel for capturing well-targeted newsletter opt-ins.
See an example of this plugin at Wedding Cake Newsletter Demo
Wordpress 2.0.x or greater
Phplist 2.10.2 or greater. (Download at www.phplist.com)
PHP 4.x or 5.x with cURL support
Quick Start Instructions
1. Download plugin installation and upload phplist-comment-subscriber.php to your plug-ins folder, usually /wp-content/plugins
2. Login to wordpress administration panel and activate the plug-in (Under plug-ins). Plugin name is phplist comments.
3. Navigate to Options -> PHPList and fill in the General Settings and Form configuration as instructed.
Detailed instructions available here