A business card should serve the same function as an elevator pitch — to evoke questions and stimulate interest in doing business with you. For that reason, your company tagline should be included.
Consider the business card as a corporate artifact — when you hand one to a prospect, client, or business contact, you leave behind a piece of your company and yourself. The secret is to make it something that people don’t want to throw away or lose because of its perceived value. The card should make a good impression but shouldn’t be a struggle to read. Too much information clutters the design and decreases the impact. Consider the information on your business card like perfume or cologne — it only takes one or two drops to produce the desired effect.
—Vince DiCecco, Your Personal Business Trainer