Nonprofit group One Laptop Per Child has relaunched its "Give 1 Get 1" promotion, resuming a program first launched in 2007. Last year, the promotion helped raise more than $35 million for laptops in Afghanistan, Iraq, Lebanon, Cambodia, Rwanda, and other developing nations.

Customers can pay $399 for two XO laptops, with one going to an impoverished child. Those who want to make a pure donation can purchase as many laptops as they want for $199 each, and designate the machines for Third World distribution.

The energy-efficient, open source laptops are available through Amazon.com. Buyers outside of the United States can participate through Amazon's U.K. Web site.

"The phenomenal success of last year's Give 1 Get 1 program created tremendous demand from both the public who wanted to give more and from countries that saw an opportunity to attack poverty through education," said Nicholas Negroponte, founder and chairman of One Laptop Per Child, in a statement. "Renewing the program now will help us scale existing deployments and expand into many other countries as well."

The rugged green and white machines, developed by Negroponte and others at MIT Media Lab, are generally sold to governments in developing countries. Some companies and organizations, including Google and the Society for Worldwide Interbank Financial Telecommunications, have promised to match or double employees' donations.

OLPC said it has distributed more than 500,000 XO laptops in 31 countries and it's near its goal of delivering 1 million laptops by the end of this year.