We recently developed a way to get rid of paper business cards and their shortcomings (e.g.: clutter). It's called Napkkin (www.napkkin.com), and it lets you create a business card on your phone and swap it with people you meet by scanning a QR Code. You can get referred by your new contacts and get notified in real-time so you can track who's helping you with word-of-mouth referrals.
We've got mobile/desktop web apps and Android/iPhone native apps set up. We're looking for feedback, so let us know what you think!
I have been generating just such a QR code on my Android phone for a few months - to pass contact info to others. Works OK.<p>Not sure about the "referral" tracking bit - but I am probably not your typical user.<p>Lot of "prior art" using infra red signals from back in the early Windows mobile days - might be worth finding out where that went in the business environment - and thus potential paying customers.
Really smart idea, site looks solid. I must admit that I'm not a huge fan of QR codes, but you mention in your response to Jordhy that it's more fail safe than Bump.<p>Looking forward to checking it out.