Eaten in Yaounde recently?
If you've been to Yaounde already, perhaps you found this place, but if not, I'd recommend "Le Samovar". It's a good place for steaks, chicken, Plov, Pizza, Italian, and the best cheeseburger in Africa (well, it's pretty darn good anyhow if not the best).
There are also numerous local "Chicken House" restaurants which are usually family ran clandestine places that you only learn about via word of mouth. I know of several, but no way I could tell you how to find them via these means. Ask around at the American Embassy for info on the best chicken houses. I haven't been in Yaounde since 2001, but lived there for seven years. There was a new place on Avenue Kennedy, but I can't remember the name. There is also a popular chicken house near the Cameroon television broadcasting center, on the way to the Presidential palace, but again, I've forgotten the name....sorry. Good luck!