Just came across this interesting piece at the Center for Global Development: "Emerging Africa: How 17 Countries Are Leading the Way". Radelet's view is summarized below:
Since 1995, seventeen African countries have defied expectations and launched a remarkable, if little-noticed, turnaround. These countries are putting behind them the conflict, stagnation, and dictatorships of the past and replacing them with steady economic growth, deepening democracy, improved governance, and decreased poverty. Five fundamental changes are at work: (1) more democratic and accountable governments; (2) more sensible economic policies; (3) the end of the debt crisis and changing relationships with donors; (4) the spread of new technologies; and (5) the emergence of a new generation of policymakers, activists, and business leaders.
Not entirely clear to me to what extent this is true of all the countries surveyed, but worth a look.