Have you been scuba diving in Namibia? What are the dive sites like inc. viz, marine life, wrecks, etc. I’m a PADI Divemaster with ~90 dives but would be travelling with someone with ~20 logged dives. Just interested to know whether it would be worth a visit!

Southwest coast of Africa… hmmm…
Well, I’m sure you’ve already discovered there aren’t any PADI dive centers in Namibia. ScubaSpots.com doesn’t list any dive shops or dive clubs there. That tells us something.
This site (http://www.namibiatourism.com.na/tourism.php) says the coastal diving is "challenging", however there does seem to be some cave diving available.
Apparently the coastal water is *cold*. Makes sense if you check out this currents map (http://upload.wikimedia.org/wikipedia/commons/7/7b/Ocean_currents_1943.jpg). The Benguela Current (http://en.wikipedia.org/wiki/Benguela_current) sweeps north up the Africa coast, bringing "frigid" water with it.
Namibia isn’t exactly a scenic spot, and the coastal water is dratted cold. Doesn’t sound like much fun to dive to me…

Mozambique, on the other hand, seems to be a possibility.