I do, and I need to get more. My initial cards came for free--I upgraded to Flickr Pro and received free business cards from Moo. The free ones I got were about half the height of a normal business card, and the type on the back is a little too small, but they're fun things to hand out when I talk to people about knitting (since my blog's about fiber arts). For the picture on the front, I used the picture that's in my blog header, so there's a visual tie between the two:
I don't really worry about a title, although my husband and I joked about a couple options. I think we settled on, "Creator, Owner, and Head Writer." :-)
I have a simple card that I designed myself (with my EXTREMELY limited artistic skills).
On the back is the web address to my central site that shows all my writing samples and links to my resume and blogs. On the front is my name and all the addresses to the many blogs I either write or contribute to. I went for cute and personal rather than plain and businesslike. I printed them out at home using Avery business card stock. It was SO cheap to do and they really look great.
I always make sure to have my cards on hand in case I run into people I know who want to know what I'm up to or if I go to blogger type events. In fact, I'm going to an SF BlogHer event soon, I'd better print up some more!
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