Had a look at the website myself - mixed feelings ...
One one had I can't really see the point Belibaste is making: The authors make a distinctive difference between "anti-zionist" and "anti-semitic". Many of the authors are Jewish themselves - or so they claim. While the website is definitively anti-zionist, I couldn't really see anti-semitism, but that's only from a cursory glance. There are may distinctly "jewish" themes - History of the Jews etc, unfortunately my knowledge of these things are pretty thin, so I am unable to verify or falsify these theories at this point in time and put them into perspective.
The website certainly has many explosive topics - some may say heretic: The holocaust is partially denied - not that the Germans didn't kill many Jews, but that no gassing has taken place in Auschwitz for instance (Finkelsteins book "The Holocaust Industry" is mentioned in this regard). In regards to this topic I don't have an firm opinion: Up to this day I always thought, that the holocaust was firmly established - but, as one of the authors have remarked (from memory): Misinformation and lies are often used to manufacture a war, probably the rule rather than the exception - so who knows ...
And white supremacist? Didn't find much clues to that effect either - so:
Summa summarum I must say that I have the same skepticism as bedower, but also cannot quite put my finger on it. I cannot see where this website would incite hatered towards Jews ... I will also look into this a bit more!
Would be very interested (from an educational point of view) to hear from more knowledgeable members as to where and why exactly they think this website is ... anti-semitic or anti-jewish or whatever.