How I Use It
I use it to reinforce topics, introduce topics, challenge my advanced learners, and to assess all of my students. I have also used the programming component with great success in my computer programming class. All around very useful for math and computer science.
I find Khan Academy to be much more than a site for videos. As a math teacher, the practice lessons make my life easier and bring a level of engagement I rarely get from worksheets in the classroom. The structure is always being improved and updated, which I like a lot. Once you set up the initial classes, it becomes a very easy and effective tool to use.