Where can I learn more about the International Space Station?

It seems quite an accomplishment to be able to have people living in space for months at a time. I am curious to learn a little more. I found a NASA site giving an idea of what life is like for people at the space station. I enjoyed it very much, especially the videos. I would like some additional more nerdy types of information. How did the space station idea evolve? How many countries were involved with building it? How often are supplies sent? How is it powered? What types of experiments are carried out? Have any of them produced significant results?