The good good people at AllAfrica.com have setup a catalog of Africa related weblogs: Blogs.AllAfrica.com.
From the short correspondence that I had with them – they have plans to transform it into some kind of full fledged blog-portal.

What has really impressed me about the folks at AllAfrica(of course apart from the great centralized african news aggregation), is the kind of thought that has gone into designing the news website (a case in point -- these guys provided categorized news feeds way before many well known news websites).
And it’s all Open Source: http://allafrica.com/etc/technology/