What a cool idea! I just got this in my e-mail today and thought I’d share: 
Offered by Printz.com, they provide a great opportunity to extend special savings to customers or people you meet at networking events. Get creative with the tear-off portion: they could be coupons, poems, samples of your work, quick tips, or even a fill in the blank “We met at _________event.”
Tags: business card design, design, Printz.com, tear-off cards, unique business card