If you have a digital signature stamp in Acrobat you can affix your signature to any PDF. Why would you want this? Well, if someone sends you a form to sign you can do that without having to print it out. Saves time and, over the long haul, you might even save a tree or two. Here’s a document that spells out the process, and here is a javascript file that you’ll use for the ‘flattening’ process that is described in the document.
And, because we really want to make it easy for you to figure out how to do this, below is a 12 minute video that demonstrates the process of creating a digital signature from start to finish.