I have a 15 year old daughter and a 23 year old daughter in a University. Both of them love Khan Academy for many different subjects (especially for math). I created my own curriculum for years before I discovered him.
It's FREE!! Any age can use it - the neon board tutorials are fantastic. Below is a link to their site, with a short introduction by the young founder of Khan Academy (and a finale by Bill Gates, who loves this guy).
After you click on this link, go immediately to the bottom and click on "What's Khan Academy All About?" It will bring you to the video.