There is a very good recent article in the *International Journal of
African Historical Studies* by Bruce Trigger called "Paradigms in
Sudan Archaeology" [vol 27 (1994): 323-345], which discusses the
shifting perspectives on the Egypt-Africa question in the
archaeological study of the region over the past century. It does a
good job of contextualizing the various arguments about this very
controversial issue.
I find it valuable to teach this topic from an intellectual
historical point of view as well as in terms of the different sorts
of data brought to bear on the argument. In this regard, Bob
Collins' selection of excerpted articles [including Seligman,
Sanders, Posnansky, Diop, Mauny, and Shaw] in "Africa and Egypt",
from his *Problems in African History: The Precolonial Centuries*
(Markus Wiener, 1994), is accessible and fairly thorough, if a little
thin on Diop's perspective. See also the first few chapters of the
UNESCO *General History of Africa*, Vol II "Ancient Civilizations of
Africa" for more of Diop, the "evidence" he put forward, and his
detractors; the controversy gets played out here in print, in an
annex to Diop's chapter.