So there's three unknowns that people will feel uncomfortable with. In your uphill battle, you will want to promote like crazy. Trying to spread the word about the benefits of digital business cards. Your best bet might be sending out press releases to whoever you think matches most closely reaches your target market. Good Luck Craig.
All help is more than appreciated.
Spreading the word out to others seems to be a large undertaking. You have a severe disadvantge in that you are trying to sell an unknown product to an unknown market. This is one of the most difficult things to do. Add to these unknowns, I'm guessing is the business or brand behind what you are selling. So there's three unknowns that people will feel uncomfortable with.