Scanner Pro 4, released in April of this year by developer Readdle, just got an update to version 4.1. Scanner Pro 4 brought a newly re-designed interface to the iPhone, as the app became a Universal binary, able to be used on any iOS device.
Today, Readdle touts iCloud integration as the next big feature to hit its document scanning app. iCloud auto sync allows any document that is scanned via the iPhone or iPad to be available on any other iCloud enabled device, all automatically and such. No more emailing documents from one device to the next, beaming, or copying to Dropbox, though those options and more are still supported.
Scanner Pro 4.1 also includes an updated iPhone interface, making it look and work more like the recently redesigned iPad UI.
Since launching in 2009, Readdle boasts that Scanner Pro has over 350 000 users using Scanner Pro regularly to scan documents, receipts and whiteboards, so you know it's a fairly good app. If those numbers don't sway you, our own reviewer called this one a best in class scanner, awarding it four stars in his review.