I saw quite a few document scanners for iOS devices at CES last week, but this is about as elegant as they come. Brookstone is offering a scanner called iConvert, which uses your iPad as the receptable for anything you scan with it. Not only does it scan your documents with a 300 dpi scanner, but it even does a very nifty graphical representation of the document showing up on the screen.
The iConvert is US$50 cheaper than the popular Doxie Go at $149, but of course this scanner is specifically built for the iPad or iPad 2 and offers fewer features than other scanners. There are also a few apps out there (including