When used properly, a business card can be a great networking tool. Great for events or casual meetings. Does your card say hello the way you want it to? Does it say it in an appropriate way?
You meet a new person, you shake hands, at some point in the interaction most people then reach for a card. That card is an extension of your conversation. Hours, days or months after that meeting that person may pull your card out and they will be staring at an representation of you. What do you want that card to say about you, not just the basics such as your name and contact info, what is it going to say about your style, your personally, your wit? Everything from the card design to the paper choice is going to show what you are about. Using a nice heavy card stock, maybe you are a sophisticated being. One color plain and simple, maybe you like the finer things in life and every detail counts. Full color, maybe you are a loud person looking for attention.
Have you ever been in that situation where you are talking to an overbearing individual that you do not want to give out ALL your info to. You can take care of this by having several different sets of business cards for different occasions. Some cards can have all your information, while others only carry select details.
Be confident that you are leaving the person with a proper representation of yourself. Make sure that your business card is consistent with who you are and what you stand for.