The Signature Add-On for Gravity Forms gives you the option to have customers sign forms right on your site. It’s super easy.
6/24/13 Update: The signature is saved as a PNG image. For security reasons, it is not sent with the usual notification of all items. In order to send a link to the signature with your notification, simply add the merge tag from the drop down on the right to your notification. If you want to include the actual signature as an attachment so that the signature shows, you’ll need to add this code to your notification.
Be sure to replace with your own signature merge tag and ID#. If you are having problems seeing the signature in your email, make sure images are enabled in your email. Sometimes there is a link to “Display Images”.