Easy Scan PDF is a simple app that uses your iPhone to take a picture of something and then email it as a PDF document.
Use your camera and take a picture of one or more documents, then email the PDF containing everything.
Use your camera, photo album and include text with your PDF documents you create and email.
Lawyers can use this to capture documents, no need to take the originals and then return them, make a copy and email as a PDF.
Get into a car wreck? Take some pictures of the damage, snap the insurance and driver license info, sent to your agent, that fast.