An excellent Google Earth layer from South African Tourism - http://earth.southafrica.net/.
Simply get Google Earth if you don't already have a copy, head over to the http://earth.southafrica.net/ site and click "Launch South African Layer" (or "Start Exploring" below it). Your browser should give you the option to open the KML file with Google Earth - it will then download (currently 520k) and Google Earth should load automatically. If not, just save the KML file anywhere, and open it from Google Earth itself (File --> Open...).
(found here)
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