Sign PDFs Digitally

It's not that I don't like paper, it's just I don't like to waste paper. Here's a way to sign PDF forms without having to print the form and sign it.

Setting a Digital Signature in OS X PreviewThis works in OS X Lion (10.7), Mountain Lion (10.8), and beyond:

• Launch Preview, and from the Preview menu select "Preferences"
• Click on "Signatures" and then "Create Signature"
• Write your signature on a piece of white paper and hold it up to the camera, try to have it somewhat straight on the blue line and watch the "Signature Preview" pane until you are satisfied with the way it looks
• Click on "Accept" to capture the digital signature

Now you can access and stamp your signature onto any PDF files opened within Preview. Technically you can store multiple signatures, so if you want to set additional ones or if your signature has changed, it's the same steps as above.
Using the Digital Signature in OS X Preview

• Open the PDF file you want to sign in Preview (you might have to Control-click and choose Open With...to get it to open in Preview and not Adobe Reader)
• Click on the Tools > Annotations > Signatures
• Now click within the document where you want the signature to appear