I actually thank you for asking this because it never even occurred to me that I should include a business card in my packaging.
makes so much sense that if someone where to ask where (since my stuff usually is involved in parties) the person got my items from and the person could simply show a business card, or in the future not have to try and track me down through through her Etsy purchases to find me.
*ads to list of things to do*
also on that note, where does everyone go to get their business cards? I've used vista print before but not sure if maybe there are better sites to use?