Here is my latest screencast demonstrating PDFpen Scan+ 1.3. This new version has a lot of improvements on both the front end (with a new iOS 7 friendly UI) and the back end (wait until you see how good it is at edge detection). This is my favorite app for turning bits of paper into digital PDF files full of OCR'd bits of awesomeness.

Here is an update screencast on how to take a picture of a document and turn it into a OCR enabled PDF with Smile's excellent PDFpen Scan+.