What math program is this?

Today my teacher was telling me about a program that she recommends to her students and i can not remember the name of it. All i can remember is the program cost about $150-160. It covered math 3 through pre-cal/trig and it was kinda like a video but i think it had some interactive elements. She showed me a preview and it looked like a flash video with lined paper for the background and would go back and forth between writing and a calculator. I was told that it is orated by a Harvard grad. She also told me that she has been recommending it to students for a long time so its not new. If i could just get the name of this that would be great, but a link to the website would be better!