A double-duty business card can be a good thing or a not-so-good thing.  Below are two very specific examples of this.

• The good double-duty business card - Using your business card for more than just telling who you are and what you do.  Print a coupon or special offer on the backs of your cards.  Include them with invoices to current customers.  If you offer a referral incentive, print it on the card.
• The not-so-good double-duty business card – Use your business card to focus on one business, not multiple. Someone whose card indicates they ‘do it all’ might be perceived as the infamous “Jack-of-all- Trades, Master of None.”  This is especially true if you use the same business card for two or more different businesses (such as your part-time real estate business and your part-time computer repair business).

If you are trying to break into a specific specialty within the same business (such as newsletter design or Web design), design a separate business card to give to your target market. Depending on your business, you might want to have a fun card and a serious card.