Check this out!

http://www.good.is/post/swipegood-lets-you-change-the-world-by-buying-whatever-you-want/

"SwipeGood simply rounds up all of your credit or debit card purchases to the nearest dollar throughout the month and then donates the lump sum to a charity of your choice at the end of 30 days. All you have to do is sign up for the service, choose a charity, and then shop like you normally would.

SwipeGood says the average user donation is $20 a month, about the cost of two for dinner at Chili's, and much more fulfilling. Happy ethical shopping." -- cited from Article on GOOD.com