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The inward flow of matter through accretion disks is driven by MHDturbulence. Global general relativistic MHD simulations shed quantitative lighton this process, revealing a number of aspects of accretion previouslyunrecognized. Among them are strong stresses in the marginally stable andplunging regions near the black hole and electromagnetically-dominated conicalrelativistic jets that can form spontaneously from the accretion flow. Theenergy release associated with both of these effects can significantly augmentthe classical energy-release estimates based on purely hydrodynamic models.Comment: to appear in Proceedings of The Multicoloured Landscape of Compact  Objects and their Explosive Origins, Cefalu, 200

Accretion and Ejection—The GR/MHD View