Absolutely! This falls under the category of Network, Network, Network!!! You want to give cards out to anyone and everyone who will take them. If you are going to any blogging conferences this year, make sure to take plenty of them. What do you want to share on them? Well, I was reading Blog Conference Guide for the (Un)Experienced and it comes down to, what is your preference? You can keep it plain and simple, or you can fancy it up to your hearts content. She also says if you don't want to share your personal info, home phone or address, then put your email address, twitter id, facebook and of course your URL. This is all very important to have on the card because you want people to be able to reach you if they need help with anything and you came to mind.
I currently have business cards for my review blog Single Parent Retreat and now that I am running not one, not two, not three, but FOUR blogs, I think I need a business card that is more and allows me to put all of my blogs on there and not focus on one blog and bring all my blogs into the limelight. I always purchase my business cards from Vista Print because well, they are the cheapest. You can purchase your business card from up to 45 designs for free. All you have to pay is shipping and handling. There are many more options you have if you choose to pay for your cards.
You can also advertise your blog with a cling to put on your car window and have more local residents start to look at your blog.