Edit: Thanks to the 162 people who have signed up so far! You've made this proposal one of the fastest-growing proposals of all time.
The math teaching SE proposal has reached the commitment phase, where it needs 200 people to register for a private beta. Many proposals stall here because they can't find 200 people to participate in a private beta; there is large initial interest, and then signups die out. If you are at all interested, please sign up at http://area51.stackexchange.com/proposals/64216/mathematics-learning-studying-and-education
The users in the private beta are supposed to ask/answer 10 questions over a period of about six months (although you can easily do this in a couple of weeks or even days).