
If you're looking for a somewhat bleak overview of corruption and despots since independence, then try Martin Meredith The State of Africa: A History of the Continent Since Independence
One of my favourites is Blood River: A Journey to Africa's Broken Heart
Disgrace, by JM Coetzee. Outstanding book, emotionally difficult to read. Made into a not-too-bad movie with John Malkovich, but the book is infinitely better.
A few example i enjoyed: The State of Africa, Martin Meredith The Code Book, Simon Singh Pity the Nation, Robert Fisk The Great War for Civilization, Robert Fisk Alan Turing: The Enigma, Andrew Hodges Long Walk to Freedom, Nelson Mandela The Last Lecture, Randy Pausch Fermat's Engima, Simon Singh
Lots more....