The online Lonely Planet Destination Guide about Namibia offers up to date travel information. This online travel guide offers broad information on several topics, but is not as informative as the books about Namibia. You can order the Lonely Planet book online if you like the information they offer. Apart from background information about Namibia, like info about culture, history and transport, you will also find an image gallery, travel forum (Thorn Tree Forum), maps, postcards and a nice set of travel links.
Very informative, no-nonsense travel guide about Namibia by Wikitravel and a good place to start exploring your travel destination. The information is divided into the following topics: regions, cities, entry requirements, getting out, languages, eating, drinking and sleeping, learning and working in Namibia, health and safety, respect and contact. For official travel advice, always check the travel advice from your own government.
This World Travel Guide provides comprehensive travel information and articles about Namibia. In the menu on the left you will find guides sorted by theme. The menu on the right side provides the table of contents for Namibia: overview, adresses, facts, public holidays, health, accommodation, doing business, communications, getting there, getting around, travel advice and a lot 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 Namibia 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.
This is a link to the official website of Windhoek, operated by the local government. Tourist information can be found in the category Tourism & Events. There you will find information on attractions, accommodation, arts and culture, events and tips for tourism.