This is a link to the online Lonely Planet travel guide about South Africa. The travel information about South Africa on their site is organized in the same manner as the Lonely Planet books, but do not expect the same indepth information. For that you will have to buy the book. This online destination guide offers the following information about South Africa: Weather, Health & Safety, Time & Place, Crossing Borders, People & Society and Culture & History. They also offer a set travel links to continue your exploration of this country.
Wikitravel is an excellent user generated travel guide supervised by administrators. On the South Africa travel page you will find the following travel topics: regions, cities, entry requirements, getting out, languages, eating, drinking and sleeping, learning and working in South Africa, health and safety, respect and contact. Information on site is mostly updated. However, we suggest you always check the travel advice from your own government first, before leaving your country.
WTG has many travel guides about all countries in the world. The guide about South Africa provides information and articles for tourists. On the left the guides are sorted by theme. The menu on the right side provides the table of contents for South Africa: overview, adresses, money, duty free, public holidays, accommodation, going out, map, images and more. You can also create a miniguide that you can print.
World66 is a nice user generated travel guide made by travelers. Every part of the travel guide can be edited directly by clicking the  button. The guide about South Africa contains information about the following travel topics: general information, map, history, practical info, economy, health, people, books and a photo gallery.
On the site of WorldTravels you will find detailed guides about a lot of countries, regions and cities. In the menu on the left you will find the city and region guides. All guides provide information on the following topics: introduction, facts, health, contact, airports, map, weather, currency, visa, photos and flights.
Here you will find a couple of guides to cities in South Africa: Bloemfontein, Cape Town, Durban, East London, Johannesburg, Kimberley, Mossel Bay, Pietersburg, Port Elizabeth, Pretoria, Stellenbosch, Sun City & Lost City. All city guides provide information about the culture and history of that city. There's also a section with a picture gallery and links to accommodation, leisure and shops (not for all cities).