Have you seen this new gadget? A Poken, they call it... in fact an USB key which contains your business cards and kind of bluetooth reader, so that when you match your poken with someone poken, they exchange their business cards.
Once back on the poken website, you can save their business cards and connect through your favorite social networks, LinkedIn, Plaxo, Facebook, etc.
You can do this with your friends, but why not with your colleagues or business contacts, even more why not connecting closer with your customers or at least providing them some online services with additional value. The Poken API is there to open your creativity!