http://www1.teachertube.com/ Very similar to YouTube, but for educators. has every lesson or topic you can think of. Very useful source for begining and seasoned educators.

http://pinterest.com/ Pinterest is a social network where you can type in a specific topic or lesson in education and find various videos, pictures or slides related to how other educators taught that particular lesson or topic and gain ideas and knowledge.

http://www.studyisland.com/web/index/ Study Island helps students in kindergarten through 12th grade master state-specific, grade-level academic standards in a fun and engaging manner.

http://www.Classworks.com Classworks is an award winning instructional improvement system that integrates instruction aligned to individual state standards and the Common Core State Standards with valid assessment, data management and goal-oriented professional learning.