Geological Society of Africa - http://www.geologicalsocietyofafrica.org/
The Geological Society of Africa website, with free email newsletter.
UK Fossils Network - http://www.ukfossils.co.uk/index.asp
Non-profit, fossil portal dedicated to beginners and enthusiasts.
About Geology - http://geology.about.com
A popular geology website which is part of the About network.