This has been a concern of mine for some time. Your post spurred me on to do something I've been meaning to do. I've designed something you can print that will fit on the business cards you can buy just about anywhere (Wal-mart included). You can also print on stiff paper and cut with a paper cutter or scissors. I've done a front and a back.
Here are the links (NOTE: The phone number is incorrect and will be fixed soon):