Nibris, a small Polish developer, are developing a game for the Revolution that will be
entirely in black & white. This to invoke a particular atmosphere of Sadness (which is also the name of the game), apparently. I think it sounds like an interesting idea.
I find the comments on the linked article pretty amusing. Seems like a lot of people feel they're not "getting their moneys worth" if a game is in black and white. If it's pulled off with enough style, and if it has a purpose beyond "being innovative" I don't see what the problem is. I don't see anyone complaining about movies that are in black & white to invoke a certain mood, atmosphere or setting.