That's also a good site. Although, he covers few whitepapers and no news. Also, his blog links aren't curated very aggressively. There is overlap, though. Perhaps over time the comments on Quant News will become part of the appeal. I just got the forum put in last night.

Edit: Thinking about your question...

I think Wilmott and Nuclear Phynance have great communities, but they would be better with a news stream to stimulate the discussion. Things move slowly until an interesting topic comes up. Then a good conversation begins. I also think people want to talk about trade ideas, but they are afraid of giving away proprietary information. So, the academic literature could jumpstart the conversation by providing detailed experiments to discuss.