The IRSpace search engine – used to conduct a federated search across all African and South African research repositories – has been updated according to the repositories listed in openDOAR.
IRSpace URL: http://www.google.com/cse/home?cx=013518019117943970829:tlw8-sayn_q
It is indexed by Google, and results are returned in the Google fashion. Search the same as you would within Google or Google Scholar.