ABBYY is a developer with some really good OCR software packages. They just announced an app for the iPhone that converts business cards to address book listings.
From the press release:
MILPITAS, Calif., Jan. 26 /PRNewswire/ -- ABBYY®, a leading provider of document recognition, data capture and linguistic software, today announced the availability of its Business Card Reader solution with support for the Apple® iPhone® 3GS, in addition to the Symbian-based version released last year. It transfers contact data such as names, phone numbers, e-mail addresses and other key information from business cards directly to the iPhone address book by using the device's camera and text recognition technology. Delivering support for 16 recognition languages, ABBYY Business Card Reader performs almost instantaneous, on-device processing of captured information, without the need for an internet connection to access external resources. ABBYY's own OCR (optical character recognition) technology that has won worldwide acclaim for its supreme accuracy in digitizing printed text makes the application a truly reliable business instrument.