Some of these images are disturbing, but this site is definitely worth viewing.
I am not convinced by their argument that 'The “N” word is not a term of endearment. It cannot be reapropriated. We cannot redefine the “N” word' because I have personally seen it redefined and I have seen it used as a term of endearment. That does not mean it is appropriate to continue using it today.
Of course, the argument is vastly more complex than this. Some of the most racist people and institutions do not use the 'No' word - they act in a way that is far more subtle.