I've been a solo practitioner for nearly 8 years now. I am somewhat embarrassed to admit that I have not had business cards during that time. On the one hand, I am extremely fortunate that I have been able to generate enough work via "word-of-mouth" that I haven't needed to do a lot of networking. On the other hand, the few times I have been asked for a card, I have had to say, "I'm working on those and will have them printed soon..."
Well, I finally made good on that promise. I worked with a graphic designer and last week I ordered my cards - they should arrive next week. This great posting by Christine Kane helped me think about how to prep my cards, and how I will use them - hope it's helpful for you too!