I was talking to Sarah a couple days ago about black & white photos & why people like them. I think that maybe it's because they are able to represent the world in a way in which you can't see it.
For most color pictures, you can stand in the same place as the lens of the camera and see the same thing (assuming that it's not a picture of a dynamic setting). But, since we don't have b/w vision, we can never visually replicate the scene of a b/w photo. It makes the image simpler and perhaps more appealing.
Personally, I like b/w, but not in all contexts. I mean, a bunch of stuff is better in color.