Ten Common Mistakes in Business Card Design
1. Cram too much information into your card.
Want to cram everything anyone might ever want to know about your business onto that tiny rectangle of paper? Use a small font size so you can add more text and cover as much of the surface of the card as you can. Who cares about making it easy to read? Your business card should contain everything, even if you have to provide a map to find your phone number on it.
2. Hide the important information.
Make your logo so small only you know what it actually looks like. Make sure your name and the company name are too small to be read without a magnifying glass: after all, anyone you give your card to knows that already. But put your fax number and physical address in large font. After all, everyone visits or faxes: no one's going to email you, are they?
3. Don't bother grouping related information together.
Have your name in one corner and your job title in the other. The company name in the middle, the address in the third corner and the phone number on the fourth. Your email address? On the back of the card, with the text informing me that it's made of recycled paper.

4. Use similar colors for the text and the background.
Contrast? What's that? You like blue, so use a bright blue background and dark blue text, except for your name, which can be in light blue. Try reading that, you pesky prospect!