I have one as one of the coordinators of my guild's ConKerrCancer Project Pillowcases. Besides info about the project guild it also has my name and email addy. I give the cards out to password along word of our project and also to people I meet that I'd like to hear from again. Having the pillowcase project name on the card helps people to remember who I am. My co-coordinor's DH made cards for me and his wife very easily using a packet of cards from Staples.
You could design your own personal card and put something special about you on it and include whatever info you like. May in Jersey