e-Infrastructure and e-Services for Developing Countries : Third International ICST Conference, AFRICOMM 2011, Zanzibar, Tansania, November 23-24, 2011, Revised Selected Papers - Radu Popescu-Zeletin, Karl Jonas, Idris A. Rai, Roch Glitho, Adolfo Villafiorita ((Lecture Notes of the Institute for Computer Sciences, Social Informatics and Telecommunications Engineering))