I think you hit on a good story in a response to someone else, about your alpha user who needed to scan a bunch of cards he collected at a conference.

Think about your (small set of) users so far. What's the coolest, most noteworthy thing someone has used your product for?

Find (or make happen) a human interest story. A bride who used the product to scan all of the business cards of all of the wedding-related vendors (florists, caterers, etc.) Someone who is using CardMunch to cure cancer.

"Accuracy" and "Ease of Use" are great-- the point is to find a narrative that gets the point across.

Tell me a "real world" story about a time when "a wrong contact was worse than no contact."