Vista Print is a website that offers business cards, mailing labels, and other products for business needs. Now they offer a line for home and family! They offer 250 business cards for free, but your choices are limited. Right now they are offering free holiday mailing labels among many other things. You do need to pay for shipping. This summer I bought cute business cards, with suns on them, to use for my swim lesson referrals.
One idea I got from a magazine would be to make "Mommy" cards. You could share your email and phone numbers at playdates or at the park easily with others with these cards. It also gives other parents a reference by writing who you are mommy of on your cards. Ex) Sarah, Mommy of Taylor (3) and Tarren (1). Then you won't be digging through your diaper bag trying to find a pen and paper amidst who knows what! (That is if your diaper bag is anything like mine.) Click HERE to check it out.