We had a question about computer donations to nonprofits in Tanzania over at the Global Legal Empowerment Network, and @InterConnection was mentioned. You might want to pop in over there to introduce yourself. It's a great community!
Getting donations of a small number of laptops seems to be a common need, but of course it's not viable for you to offer directly as a service for nonprofits in Africa. Have you any experience or insight to share with working with Pack for a Purpose or some similar group to have tourists and other visitors to African countries deliver one or two laptops to a nonprofit? Or informal ways to get this done?