Back in the days, I had this teacher who had just bought a Mac and Mathematica, he was talking of an investment of 10k altogether. This guy really loved math, and was doing a great job and sharing/teaching his passion to us young punks. I wonder what he would say of O'Reilly putting Mathematica online. I think he would be happy because it's making a world class tools available to all. I think it's great of O'Reilly to go out and put this together.