NCTM is a website that is very helpful to teachers to meet others and constantly learn new ways of teaching. This is a resource that takes care of the big picture of education.
Council in which math teachers and students planning to teach math can join. This is the national Council but there is a local one and that is the North Carolina Council of Math Teachers.
National Council for the Social Studies is an advocacy group devoted solely to Social Studies Education. They offer support, conferences, and publications about current affairs in the Study of Social Studies Education.
National Council of Teachers of Mathematics: Middle School Resources. Provides focal points, math problems, student activity sheets, weekly problems, tips for teachers, and lessons and activities.
This is a great source for Middle Grades Mathematics Teachers (or any level Mathematics teachers.). It can be used to find supplemental instruction such as activity sheets, daily problems and tips on different issues with your students.
See real middle school teachers incorporating the National Council of Teachers of Mathematics standards into their lessons, while learning as much about teaching as their students do about math. The programs demonstrate how teachers guide and assess student understanding, and offer strategies for keeping students motivated and engaged at this critical age.
This site is full of great resources for english teachers. You can also become a member which allows you to connect with other teachers and recieve newsletters.