I think business cards are very important. They are what you leave behind and need to make a good impression and be thoughtfully designed so the person you have given your card to (a) remembers you and what you do, and (b) doesn't throw it into the recycle bin when they empty their pocket later that evening.
I'm working on business card designs for a client, and was telling her how people seem to like to choose their own cards and was suggesting this as an option to her. I have three front designs to my own business card. They are subtle, but different. For printing, I used Moo.com's very cool Printfinity option. For a different front - or back - you can change up words, designs, photos and more.