Here's a few more great tips on using your business cards for marketing:
There a lot of sports fans, so another way to added value to your business card is to print the schedule of your regional sports team on the back of the card. You can change it as seasons end and begin.
I haven't done this personally, but I have seen it done. Go to the library and bookstores and place your business cards in all the real estate and mortgage books. Be sure to write on the back of the cards something like, "Here's my business card to use as a bookmark. If you have any questions about anything you are reading, feel free to give me a call." Again, you are getting your business card in front of motivated prospects. You can't ask for more than that.
Give plenty of extra cards to spouses, family and friends. Let them know how important it is to your business for them to give out your cards and how much you appreciate their help. To give them added motivation, place a tracking number on the back of each business card. Tell your friends and family that each time someone new contacts you and purchases a home because of the business card, you will treat them to a pair of movie tickets.