What are some ways that computers may be used in education?

Computers have great promise for enriching education, but it seems to me that so far little use has been made of them. What I particularly like about the potential use of computers is the interactive possibilities, which would put the learner in charge.

Here are some thoughts I have on this.

One use that I like is for the student to create problems for testing. This is particularly easy for math problems.

There are some very good geometry programs like Geometer’s Sketchpad and the free Geogebra program. While these programs are great for exploration, it is not possible, so far as I can tell, for a teacher to give an assignment using these programs in such a way that it is easy to tell if the answer has been correctly arrived at.

The area of simulation offers all kinds of possibilities. Historical simulations provide an interesting viewpoint for historical events. Science simulations offer the possibility of doing through simulation experiments that would otherwise be costly, difficult to set up and potentially dangerous.

I am sure that I am just scratching the surface. What other things can be done?