"The i’m™ Initiative from Windows Live™ Messenger makes helping your favorite cause as easy as sending an instant message. Every time you start a conversation using i’m, we share a portion of our advertising revenue with some of the world's most effective social cause organizations. Each of our partners will get a minimum of $100,000. As for the maximum? There is none. The sky's the limit.

It's simple. It's free. You IM, we give."

http://im.live.com/Messenger/IM/Home/