I remember seeing years ago (long before the handheld device took off) researchers were working on a device that would swap business/contact information digitally through a handshake. The device was contained in your shoe.

While I like the idea of digital exchanges of information (the above idea never really took off), I just don't think this is terribly practical, especially the deep rooted customs, such as business cards and handshakes.

All the best of luck though, I'd sure as hell like to be proven wrong.

Now, if you could figure out a way to exchange information through a handshake with the phone sitting in your pocket, you have a goldmine right there sirs. I'm pretty sure you wouldn't even have to give it away.