Via Popular Science, here is a video from two researchers at Cal Tech. It shows water droplets bouncing off a surface made of carbon nanotubes:
The surface is superhydrophobic, which is to say that it repels water to an extreme degree. From the PopSci page:
Hydrophobic materials have all kinds of practical applications, from creating surfaces that never have to be cleaned to making supertankers and container ships glide more efficiently through the water.