You Should Know about Knowmia

Knowmia started up earlier this year, and has grown to over 8000 teacher-submitted videos for high school students.  The site is similar to Khan Academy, with a couple of significant differences.  First, the level is specifically aimed for students in grades 9-12.  Second, you can submit your own videos that you create, either from your computer or from an iPad.  Of course, it's completely free.  You should take a look and see what Knowmia can do for your students!