You're right, I don't think we ever had a report from Africa on these boards, or on the old PL site (course there's no place set up for them either). In the last couple of years several introduction sites have been created for ladies from Africa, some of them seem to receive quite a bit of traffic. The ladies appear very motivated and interested in meeting foreign guys (black, brown or white).
Language and distance/costs appear to be the primary barriers. Certainly in South Africa, Nigeria, Ghana, and Kenya the English language is spoken to one degree or another, less so in Ethiopia. It also seems that many of the ladies from Ethiopia are very religious and conservative.
Without being offensive, some of the monger sites have "travel" reports about these countries.