I would like to thank Prof. Doug Oldenburg at the University of British Columbia for being the first person to believe in any of my crazy ideas. Next, I would like to thank Wafik Beydoun for being the first MIT graduate to actually believe in any of my crazy ideas! (What is it with you MIT guys, anyway, eh?) Also, I would like to thank Robert Withers and the members of the Reservoir Geophysics Group at Exploration Research, ARCO Oil and Gas Company, Plano, Texas; many of the ideas presented here have crystallized through numerous stimulating discussions with that group and others at ARCO. --Oh yeah, and Ken Tubman!