Teachers helping Teachers, provided by a California middle school instructor, provides ideas and tips in the form of lesson plans and classroom activities. The content has been submitted by teachers for teachers. The site is designed to be an aid to teachers in K through 12, and provides ideas for classroom management, language arts, math, science, social studies, the arts, and special education. In addition, there is a topic of the week, and a selected list of other educational pointers in various subjects.
http://www.pacificnet.net/~mandel/