There is an approach without using widgets. It can be used to get a newsletter signup form.
You can try the code in this article:
http://www.techlila.com/how-to-add-newsletter-signup-box-genesis/
It will not work as it is. You will need to make one change.
The author of the techlila site has added this code at the end of the function:
add_action ( 'genesis_after_post_content', 'add_newsletter_box', 10, 1);
You will need to replace this line by:
add_action ( ''genesis_after_entry_content'', 'add_newsletter_box', 10, 1);
As far as I have understood, the hook name changed in the latest version of Genesis.
What I am sure of is that it works in Genesis 2.0.
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