Yesterday I began pondering how incredibly efficient it would be to have calling cards. There would be no more "That's 'Allison' with 2 L's," and other little things like that. Just whip out a card and you're done!
There are a lot more on etsy.com, where I found all of these. For example, they also have calling cards for mommies (for organizing play dates and such), which is quite clever! The ones I put up here are more conservative in style, and more neutral in purpose, but if you're looking for something different, I assure you, someone on etsy is offering it.
