When it comes to business cards, do you use different business cards depending on who and what audience you are targeting?

Example: When I am targeting for party bookings and/or sales/customers...I use one type of business card.

Then for fundraiser contacts, I have different business cards and then if I am sending out recruiting and biz oppty packets, I use another type of business card.

Second part:

Do you use the backside of your business card to print a coupon onto it or other type of info or do you leave the backside of your biz card blank?