Pledgebank is a great example of a technology of cooperation -- you can pledge to do something (usually, some kind of contribution to public goods) if and only if a specified number of other people agree to join you. Lucy Hooberman asked for 250 people to join her in mentoring people in the developing world. At last count, she had been joined by 350 others. It's not too late to join!

I will mentor a minimum of two people in the developing world in the area of my skills base and expertise (media, communications, broadcasting , democratic media building, participatory media, community video). I will do this for free for a minimum of six months (in my free time). The mentoring will be in person or via email/skype and the mentoring connections will be established by a website and database that I am willing to take responsibility for creating but only if 250 other people will mentor a minimum of two people in their skills.