I think Moo has helped foster this calling card movement because it's cheap and you can have 100 different calling cards all for the same price. Moo cards are really good quality and so small too. I'm also pro QR code and I'm just shocked that outside of Japan more nerds have not started using them. I'm also more inclined to use a Friendfeed or profilactic.com address on my cards than I am to list all the services I'm found on.