If you are interested in having an additional resource then I would suggest getting them. However, like any tool you need to know how to properly use them or you might as well not have them at all.
(1) Do not – DO NOT – go around giving your card to every tom male private part and firm partner you come into contact with. The proper time to give your card is when you are ASKED for your information. “Let’s talk, what’s your e-mail address” or “I’ll send you an application, where can I mail it?”
(2) Get as many business cards from OTHER people as you can. Write a little something about them on the back. Follow up. You are a lot more likely to contact a practicing lawyer after a luncheon or a forum then they are to contact you.
(3) When you follow up with a letter and resume, add your business card. Many lawyers will file or forward resumes as a matter of course but will give a business card to their secretary to add to their contact list.
(4) Just because you can get as many colors or pattern or pictures as you’re little 1L heart pleases for the same price please dear goodness remember your going to be a lawyer no granite backgrounds, no rainbows, no pictures (vanity kills), an no flashy colors. Use one or two colors, a simply icon if you choose, a conservative font… if it does not look like something a firm would give out, you shouldn’t either