Mathoverflow.net - for research level math questions
mathoverflow.net
mathoverflow.net
One things, though, is that I am sad that it is just for questions. It seems like they could harvest this group of people and write some nice explanations to some difficult problems, yet their FAQ explicitly doesn't want this:
"MathOverflow is not an encyclopedia. MO is a site for questions that have answers. MathOverflow visitors should know how to learn new things and do mathematics on their own, but we all get stuck sometimes, and this is where MO saves the day."
Check out the group discussion interface at http://braintrust.io, it caters to actual debate and discussion taking place.
Screenshot here: http://braintrust.io/about/3.gif
Im repeatedly amazed at how many heavy hitters in math research are active on MO
BUT a word of caution:
I would expect that you'll receive a letter from StackOverflow's legal counsel regarding trademark violation for your domain name - rename now before you get enough traction to matter . . .