My Fave: CardMunch
CardMunch 3.0 by LinkedIn - the iPhone app that turns your business cards into contacts, now with LinkedIn integration.
Simply capture images of business cards using the CardMunch application and a real human workforce will manually transcribe each and every card you submit.
* Convert business cards to address book contacts, and then add them as connections on LinkedIn.
* View relevant LinkedIn profile info, connections in common, work history, and more, for the cards you scan.
* Manual transcription ensures high accuracy for scanned cards.
* There are now 3 different ways to add contacts to your iPhone address book.
Find out more on CardMunch.com