I have been following your exposé of CDC and Actis for a little while and, whilst I applaud your dedication and doubt that said organisations' motives are entirely pure, I do feel that you are labouring under several delusions.
Your ire centres around the idea that CDC is investing, not in "agriculture", but in technologies such as mobile phone networks which is not an appropriate way to "spend the taxpayers' money intended for poverty relief". Fair enough.
Except that several reports have shown that mobile phones have an extraordinary and positive impact on development in poorer countries; one showed that a rise of 10 mobile phones per 100 people leads to a 1.5% rise in the growth of GDP. Amongst other things, they allow the farmers that you profess to champion to 'phone the nearest population centres—rather than having to pick one to travel to—and determine the best price for their products.
Further, another recent study showed that the building of reliable infrastructure had a far more positive impact on the development of Western economies than protectionism, for instance, ever did and so I would have thought that you would applaud the constructing of such infrastructure in Africa and other developing nations.
You also claim that CDC is "deserting third world agriculture"; it might have escaped your notice but the development of Western societies shows that everyone wishes to desert third world-style agriculture: in this country, for instance, people preferred to work down the coal mines—hardly a walk in the park—rather than continue in subsistence farming.
If our government was really interested in helping these impoverished nations, they would sponsor action to enact, and enforce, strong property rights laws: once a farmer can be sure that his land will not be removed at a moment's notice, and with no compensation, he may determine that land to be worth investing in. Further, his land would then provide collateral for loans to make that investment.
As things currently stand, in all too many countries, farmers do not have that assurance. As it is then, we should help them to make the best of their position and building a technological infrastructure—given the geographical and capital problems inherent in building a tight physical one—has been shown to be an excellent way in which to do that.