No until recently I change the back design on my business card from a blank backside to a quick 3 seconds list of some of the task or projects I do.
I took that decision after investing for the first time in a nice printing set of business cards and people were impressed by the quality of the card at touch and the second thing people would do after reading the front of my business card was .. to turn the card to continuing reading the back....
I believe is a great idea to use that back space to shine our services.