I recently proposed Science Educators, a site where teachers and tutors of any field of science (physics, chemistry, biology, earth sciences) can ask questions.
I decided to join forces with all sciences since Mathematics Educators is not getting sufficient traffic to graduate (currently at 1.5 questions out of 10 per day, which is low since the site is quite old), therefore I considered it unlikely that any of the sites (physics, chemistry, biology, earth sciences) could get launched an Educators site on there own.
So, if you are interested, please follow the proposal, and create and vote for example questions.
Since the old one was closed, here is a new proposal: