It's the world first "Giving Business Card".
B1G1 provide you with some graphics->
...that you can include on the back side of your existing business card.
The recipient can then use this $1 voucher to give towards the cause of their choice, with the option to give more.
B1G1 will track the donations for you so you can re-connect with the "giver" again.
Charity and good business can really go hand in hand.
Check out their website - http://www.b1g1.com/buy1give1/