Today China, the European Union, India, Japan, Russia, the United States and South Korea have signed the an agreement for the development of a international experimental thermonuclear reactor. The project named ITER will be constructed in Cadarache, southern France, and will start in 2008, the planned cost are around 10 billion Euros. Negotiations started in 1996 and are finished as from today.
ITER will do research on nuclear fusion and a way to make this available outside a research environment. You can see the scale of the reactor if you click on the image, the man at the bottom of the reactor indicates it total size.
Even do the project is quite ambitious the ITER project will not be the first to successfully build a nuclear fusion reactor, today Thiago Olson, a 17 old student reported that he build a reactor in the basement of his parents and scientists have found his reports true.