Given the recent violence against immigrants in Johannesburg, Capetown, and elsewhere in South Africa (see accounts here, here, and here), some may be interested in research on migration in Africa and South Africa in particular.
One resource is the Forced Migration Studies Program at the University of the Witwatersrand in Johannesburg. (It’s director, Loren Landau, is a friend from graduate school.) See, for example, their response (pdf) to the recent violence, which undercuts the government’s claim that this violence was “a totally unexpected phenomenon.” See also these papers on migration from Zimbabwe. Other working papers are here.