An american family i know had a friend from somewhere in africa. (Can't remember exactly where now.) Anyway, apparently some woman who needed to put his race on a form wouldn't accept 'african'. She was like 'african american?' and somehow couldn't come to terms with the idea of a black person who wasn't american.
I personally feel that the whole PC thing has gone too far these days. (And I'm not just reffering to what to call black people.) I'm quite happy to be called white or beige or European or anything else really, and my feeling is that so long as blatantly offensive terms are avoided, (eg, n****r, f****t etc) people shouldn't make such a fuss. The worst is watching people trying to describe someone who has darkish skin but there not sure whether he's from india, an arab state, even southern mediteranean. (And before people jump on me, I'm not suggesting that they're 'all the same' or something.)