GKauten

Integrates the AWeber contact registration script into your WordPress registration process. 
Users are seamlessly added to your AWeber account during registration on your site, either 
by request or silently. If you do not yet have an AWeber account, you will need to 
visit their website (http://www.aweber.com) and sign up for one.
If you find this plugin useful, please donate. Donations help pay for my AWeber account which 
allows me to continue supporting and improving this plugin as WordPress and Aweber continue 
to evolve on their respective paths.
Special thanks to Guru Consulting Services, Inc. (http://www.gurucs.com) for their 
original platform on which some of these functions derive.

AWeber Registration Integration

Integrates the AWeber contact registration script into your WordPress user registration process.

viperchill

ViperBar adds an attractive bar to your site header, which you can use to increase blog or newsletter subscribers. It includes built in styling, Aweber & Feedburner integration, conversion rate tracking, split-testing, themes, and much more.
<a href="http://www.viperchill.com/" rel="nofollow ugc">ViperChill</a>, a blog on Viral Marketing, is the creator of this plugin. If you want to take your blog to the next level, you should read this post on <a href="http://www.viperchill.com/wordpress-seo/" rel="nofollow ugc">WordPress SEO</a>.
<h3>Donations</h3>
You may make donations at http://www.viperchill.com

ViperBar

ViperBar adds an attractive bar to your site header, which you can use to increase blog or newsletter subscribers.

AWeber Registration Integration vs ViperBar