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Einstein@Home asks you to devote your computer's spare cycles to helping prove Einstein's General Theory of Relativity:
Einstein@Home is a project developed to search data from the Laser Interferometer Gravitational wave Observatory (LIGO) in the US and from the GEO 600 gravitational wave observatory in Germany for signals coming from extremely dense, rapidly rotating stars. Such sources are believed to be either quark stars or neutron stars, and a subclass of these are already observed by conventional means as pulsars or X-ray emitting celestial objects. Scientists believe that some of these compact stars may not be perfectly spherical, and if so, they should emit characteristic gravitational waves, which LIGO and GEO 600 may begin to detect in coming months.Link (Thanks, Dan!)
I write books. My latest is a YA science fiction novel called Homeland (it's the sequel to Little Brother). More books: Rapture of the Nerds (a novel, with Charlie Stross); With a Little Help (short stories); and The Great Big Beautiful Tomorrow (novella and nonfic). I speak all over the place and I tweet and tumble, too.