The basic and may be the oldest item that we use to give the basic information of our business is the business cards. And I believe they never will go out of fashion.
I guess that's true.
Nowadays the most popular and functional ones are with a usb integrated; where you can store information on your business; which is quite handly.
However still, the design of the card itself has to be quite appealing for a good first impression.
Design is the Salt X Pepper of life. It is not a must, but if you have it, then you have the appetite for life.