The Japanese seem to have this reverential attitude toward business cards. Typically, a Japanese businessman will hand his card to you with both hands, as if it were a plaque or a ceremonial sword. I remember this well because of a massive faux pax I committed years ago. I made the error of scribbling my phone number on a slip of paper, after I received the business card of a Japanese guest to a semi-formal social function (yes, I sometimes attend one of those). He was quite polite, even smiling as he slipped the slip of paper into his wallet, but to my horror, I would see later how other people did their self-introduction properly, bowing slightly while holding out their own business cards with both hands.
Well, who knows, maybe now they'll be exchanging e-cards by holding out their cellphones at arm's length like two samurai warriors about to do battle.