Comment on WordPress Hacks by SEO Dave.

WordPress Hacks You could add an Aweber form above the comment form by editing the template pages single.php and pages.php

Find the line:

?php if (function_exists('wp_list_comments')): ?

And above it add your Aweber code.

That should put your Aweber form above the comments form on the single posts and static pages.

If you only want the Aweber form turn comments off on the site.

David