I use calling cards. Not for their original intention, but as gift enclosures. And I now have some that simply have my name, phone number and e- mail (sidebar: if I see another pair of people standing, peering into their iPhones exchanging digits, I think I'll just go over the edge... put your info on a card and hand it over. It looks a lot more pulled together). I kind of think of them as the stay-at-home mom's business card.