Evernote is an application and Web service that allows you to capture information in a number of ways and then makes that information searchable and accessible from your desktop, mobile device and the Web.
At a very basic level it is a note-taking application, but its search and tagging features make finding saved information very easy. You can create new notes using desktop, Web or mobile versions of Evernote—and the desktop version is available in Windows or Mac format. You can clip entire Web pages, screenshots and just about anything that you can copy to your clipboard. You can also take a snapshot using a camera phone or Webcam and the item will be saved and indexed using optical recognition software. This is great for all those little stubs of paper such as receipts, ticket stubs, business cards, and just about any paper document.
I have been using it to take pictures of paper documents with my camera phone and then Email them to Evernote. The Evernote desktop application periodically syncs up with the Evernote server and soon the snapshot of the document as well as its contents are added to my Evernote database. I am very impressed with this tool and am finding it very useful in my day to day work.