This app is awesome. It allows you to take a picture of something, such as a document, sign, etc., and automatically crops it, eliminates unnecessary background and either color enhances, or makes it black and white. In addition it will organize your document with titles, tags, etc. and allows you to export it as a picture into your Photo Library, Dropbox, etc., or as a PDF, which you can email. This is a great app for note-taking, as you can just snap a picture, crop and go!
Compatible with iPhone, iPod touch, and iPad.