Dave Doolin

Aweber Super Simple is a plugin that will subscribe a user whenever 
he/she registers to your blog.
The AWeber Super Simple options page allows you to configure the plugin to: 
* Choose whether or not to display the optin checkbox. Users may register if optin isn’t shown, and will not added to autoresponder. 
* Choose a checked or unchecked default status for the optin checkbox on registration. 
* Provide a custom optin greeting message for visitors
This code base is at least once, possibly 3, 3 or more times removed from what was the original 
code base. Wherever or whenever the ultimate source, the base code is old in WordPress years. 
Current effort is to bring everything up to 2.8 coding standards before attempting any extensions.
<h3>Support</h3>
Initial functionality will be supported on a time-available basis.
Installation, configuration and further programming support may be 
available on a contract basis. Contact author with request.

Aweber Super Simple

AWeber Super Simple allows you to subscribe users to an AWeber autoresponder when they register on your blog. NOTE: ALPHA VERSION.  Be careful.

shabbirbhimani

Footer Slideup Form is one of the best ways to ask users to subscribe to your list without any interruption or blocking and this plugin does exactly that. It adds an AWeber subscribe form in the footer of your WordPress blog. If you aren’t sure what is AWeber, you can read detailed <a HREF="http://imtips.co/aweber-autoresponder-review.html" rel="nofollow ugc">AWeber Autoresponder Review</a> on my blog.

AWeber Footer SlideUp

Adds sliding Aweber Opt-In form in the footer and user's can subscribe to your list.

Aweber Super Simple vs AWeber Footer SlideUp