As an “electronic business card”, I prefer Microsoft’s Tag. It’s a free app that uses your mobile’s camera. Once you have the app, scanning your custom tag/barcode will load your custom web page in the phone’s browser. So if you have your tag somewhere on you, say on your name badge, anyone can connect to your contact details. Using history, you can go back and download their contacts/.vcf files. Easy, fun, uses hardware you will have with you. There are links to get the application and to build a tag. It’s in beta so there could be licencing costs later. The phone app page will recognise which version you need if you go to www.gettag.mobi Lots of possibilities….