We have found the following links very useful.

Main overland travel sites and forums

By far one of the best sites you can get listed on and look for info is the Africa Overland Site.  Its got lots of data and trip info on past, current and future trips: http://www.africa-overland.net/ 

The Horizons Unlimited site is more for bikers but has 4x4 section in it too.  This site has a VERY comprehensive list of forums and threads and people are posting information to it all the time, especially on things like border crossings, travel tips, news, equipment, routes and experiences along the way: http://www.horizonsunlimited.com/hubb/ 

A couple of South African 4x4 / overland sites worthy of mention are:

Fellow overlander websites who are planning to travel in 2007 and beyond are listed below.  Drop us an email if you want to add a link here too.

* Indicates good GPS data included

Some good reference sites from other overlanders who have done it!

Vehicle Preprartion Specialists

Land Rover Events & 4x4 Specific Information & Courses

Navigation, Maps, GPS, Communications

Weather

Visas, Insurance, Shipping & Paperwork

Books