I have discovered three discussion groups on Egroups (I've been subscribed to several Egroups, including EducationNews digest).

http://www.egroups.com/group/ mathpolemica
http://www.egroups.com/messages/ GTASingaporeMath
http://www.egroups.com/group/ SingaporeMath

The former is still quiet, but, maybe with a little push, may become a real barn burner.

The other two are quite chatty. However, they seem to be mostly local questions. I have not seen the larger issues being discussed there. Any takers?