Usability 
MECARD is new format for sharing contact information. A MECARD is a single line of text containing all the meta data needed to populate an address book entry, including name, address, telephone number, email address and URL.
This Me Card web app from Coldtags Suite saves the contact information you enter in HTML5 local storage and creates a QRCode containing your MECARD. It works with most mobile barcode scanners and operating systems. I used it successfully with Barcode Scanner on Android and UpCode on a Nokia N8