Apple Thoughts: Add Signature to PDF With Lion

"There's plenty of software programs on the Mac App Store that will allow you to add a signature to a PDF, but come Lion, you won't need any of them: Preview.app will do it by creating a perfect digital pen signature via FaceTime."

A step-by-step how to on how to add your signature to PDF files via Lion. Using the Preview app and your camera with FaceTme allows you to add your signature pretty easily. And the signature will be available for future documents once you get it done the first time. Handy!