Phone cameras are handy for note-taking, but when you want to share images it's irritating to have to send them one at a time. The Pocket Scanner app lets you collate images from your photo library and print to PDF. You can then send the finished product from your phone's email client.
Within the app itself, you can do some pretty nifty stuff, including manipulating pagination and creating tables of contents, cropping and resizing, and setting margin and page layouts. One feature we'd like to see is the ability for users to reorder images before creating a PDF: be sure to upload your images in the desired final order.
OK, so you want to stamp your document. Maybe you need to give reviewers some advice about the document's status or sensitivity. This tip from author Ted Padova demonstrates how to add stamps with the Stamp Tool along with related comments.