China Vows to Stop the Rain
Since the Olympic stadium doesn't have a roof, the Beijing Meteorological Bureau has been given the task of making sure the games remain dry. According to Zhang Qian, head of weather manipulation (best title to have on a business card ever) at the bureau, they've had success with light rain but heavy rain remains tough to control. I see a hurricane cannon in some lucky country's future.
They don't actually *stop* the rain. It's most likely cloud seeding and similar... removing all the water from the clouds by making it fall early one way or another. Now, large scale weather manipulation is bad... but a few weeks in one city isn't going to hurt anything. Yea yea, butterfly effect and all... but also dynamic equilibrium.