A few sites that I find are well-worth a visit:
Blogging while allatsea: A veritable treasure trove of history with the main focus being on transportation and memorials.
Musings while allatsea: A travel blog of adventures around Britain and South Africa.
Facts About Durban: The home-page of the well-known book, Facts about Durban, by Allan Jackson, a passionate recorder of Durban history.
Mole’s Genealogy Blog: A searchable blog-site of the well-respected genealogical and historical researcher in Durban, Rosemary Dixon-Smith, with a well-written guide to family history research, many transcriptions and other fascinating accounts.
KZN: A Photographic and Historical Record: As the title suggests, this is a searchable gallery of high-quality photographs from around Natal.