Want to entertain your students and teach them at the same time; check out this site. All of you math, history, and science people will have a ball using this site in your class; it even scores the quizzes.
This is a great site to steer professional learning communities within your department. Teachers can find tons of articles and resources that will assist in becoming an effective leader within your learning community. One can also find lots of resources on how to integrate technology into the curriculum seamlessly.
This a great site for the teacher who is looking for ways to incorporate technology into instruction with little or almost no effort at all; and it is free. This site provides a variety of tools that will benefit all classroom teachers and students regardless of subject matter.