Japanese technology at its best?

Which museum or exhibition shows Japan's development of science and technology at its best?

Can you recommend one that gives you the opportunity to see the best that Japan can offer in action or even hands-on.

You might be interested in Future science museum called Miraikan, and a Toyota museum called Mega web. Both are located in Odaiba, Tokyo.
See:
www.miraikan.jst.go.jp
www.megaweb.gr.jp

I went to Miraikan the other day, it was an interesting science museum, the Toyota Megaweb is just a showroom with some of the latest Toyota Cars, I guess if you were on Odaiba to see both of those things, you might as well stop by the Panasonic Showroom to see the latest Panasonic gadgets, and the maritime science museum that is also located on Odaiba.

http://www.japan-guide.com/e/e3008.html