This short Guardian UK book discusses the relatively recent increase in the availablity of data and the way that reporters (and the public) can analyse it to find information of public importance hidden in the numbers. Examples are mainly from the Wiki Leaks data and the data released by various governments. Useful sources are listed, including the Guardian's own data site. Memorable facts emerge, such as that pointing out that the richest 1% of the US population own one third of US net worth.
This is a useful source book, and a comforting rejoinder to the Flat Earth News: An Award-winning Reporter Exposes Falsehood, Distortion and Propaganda in the Global Media
by the Guardian's Nick Davies, which seemed to predict the death of investigative journalism.