This is the best resource ever! There are so many great videos, slidshows, songs! This site has it all and the material is wonderful to show in the classroom. The site is free and you can add your own material if you wish to share it. There are some really creative teachers out there! This will be a place you can spend hours upon hours exploring.
This site is similar to YouTube only it features videos, audios, etc. that relate more to education. This site allows you to find videos to use in your curriculum and your classroom to help students understand the material. Anyone can pick from the videos already available or you can upload your own material. Also, teacher tube has an educational blog that you can access and add to.