This allows someone to grab their mobile phone, scan the QR code and save the information to their address book. Now if they lose the card they still have my information on their smartphone.
I handed out many such cards at Black Hat and DefCon and they were a huge success with people.
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While that's true, that might change and Sharesquare is betting on that. It's still too early to tell where this market might end up (in the US).
In Japan it's as common as putting your website on an ad or business card.
Or, you can put a QR Code on a business card that represents a valid vCard, such as what I have done:
http://i.imgur.com/HpbLO.png
This allows someone to grab their mobile phone, scan the QR code and save the information to their address book. Now if they lose the card they still have my information on their smartphone.
I handed out many such cards at Black Hat and DefCon and they were a huge success with people.