Several people have been sharing links to Scanner Pro, which is currently free.
What is it?
It basically turns your iOS device into a portable scanner.
You can scan and convert a wide variety of documents to PDF and then save them to your cloud storage, be that iCloud, Dropbox or Google Drive. It’s also got integration with Evernote and WebDAV, so it’s very flexible.
From the official site:
Scan receipts to keep track of travel expenses
Convert paper notes and sketches into digital copies
Sign and scan contracts to email them back
Save interesting articles and book pages for further reading
You can download Scanner Pro here.