If you've ever wondered what some of today's top supercomputers are up to, this article on CNN explains many of the more common applications. Some of them are used for tasks like forecasting weather, designing safer more fuel-efficient cars, mapping DNA, exploring the cosmos and even calculating the curvature of Pringles potato chips.
While you're there, be sure to check out the gallery of well known supercomputers. And click the tab that compares a standard PC to a supercomputer as well. If you think current desktop systems use a ton of power, how does 1.5 megawatts and 5.8 million BTUs per hour sound?