Genius Scan is a very smart document scanner app.

If you are a business traveler, you certainly deal on a regular basis with an onslaught of receipts and other documents like business cards or brochures that need to be preserved for accounting or taxes purpose or for future uses. But on the road and far from your office, you are time and space constraint in terms of getting organized and filing things away. That's where a new app for the iPhone called Genius Scan comes handy. It allows you to have all of your receipts and any other important documents saved on your phone in case the original is lost. The app works by transforming snapshots of documents you take into PDF and JPG images.
According to AppScout, Genius Scan Genius Scan doesn't do text recognition but is smart enough to do other things like recognize the edges of whatever document you are scanning so you only get the information needed. It also does angle correction of a snapshot taken at an odd angle so that the scanned document is stored straight on.
The app process the scan right from your phone and store the final product there too so you will not need to use your phone service data plan or a Wi-Fi hot spot for it to go to work.
Scan Genius is free and available for the iPhone and iPod Touch running iOS 4 or newer.

For more, see AppScout.com