Intrigued about the future of QR Codes... so got one all my own :)

In a nutshell:
The info you want to share on a business card 'bar code' - no matter who has your card, where they are or how long they have had it - your details will be current if you ensure you keep your account details accurate.

Recipients of your card or even just the QR code - simply scan with their Smart phone to download your 'business card' (it is very nicely laid out too, corporate, uncomplicated and open to individualisation).

You maintain your account with the sort of details you want to share ie: Twitter/LinkedIn/FaceBook & other social media links, website & email, company name & job title, contact details, image etc. and each time your particular QR code is scanned - it will show what you have entered as it gets its info from your account.

If you're interested, you could go to http://getqrky.com/ or follow @QRky on Twitter to find out more.