This article is worth a read but I don't believe it does Biko justice. He was to anti-imperialism in Africa what Gramsci was to the development of contemporary socialist thought. He was that rare combination of brilliant theorist, canny tactician, and spiritual savant. I think it is a pity that he and Chris Hani have been largely forgotten while much less deserving South Africans enjoy international acclaim ( and great wealth ) for leadership in the anti-apartheid struggle.
http://www.pambazuka.org/en/category/features/78867