Edit: Thanks to everyone who has signed up. There are already 162 participants, a number which usually takes several months to acheive.
As mentioned in this post, there is a proposal on Area51 for a Math Teaching and Pedagogy Site. This site proposal has been successful up to this point, and is now registering 200 users for a short private beta (where users are asked to ask or answer 10 questions).
Input from people with a lot of teaching experience would be especially be interested. To commit or to see a list of sample questions, go to: http://area51.stackexchange.com/proposals/64216/mathematics-learning-studying-and-education