One of the innovative frogfoot frogs, Joe, mentions that two of my favourite companies, Amobia and Inkululeku, are working together to wirelessly "wire" up schools in the Western Cape.
Until such time that there are decent fixed-line options, wireless is an easy winner in terms of installation time for the last-mile connectivity, and Amobia's investment into creating software to manage their network should pay off in terms of implementation time and future maintenance.