AstorB and DJ4,
There are lot's of white women who will go out with black men. They seem to fall into 2 main categories..... the first and largest(no pun intended) category is Fat/Chubby. They seem to select black men as a means of getting with a more physically attractive guy. It's like Astor said, most good-looking white guys wouldn't consider one of these chubbies.
The second category is a bit more interesting. These women are generally very good looking. I suspect that they consider themselves to be superior physical specimens and that's what they're looking for in a man. Now, I live in Canada, so things might be a bit different up here. But, it's no big deal to see a really fine, fit white girl who dates black men exclusively. It's actually become something of a cliche.
Interestingly enough, the reverse (white guy-black girl) is a fairly rare sight. I'd say the most common inter-racial couples would be a white guyasian girl and the white girl/black guy.
Rock