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9 Acknowledgements

We are grateful to John Baez, Chris Beetle, Alejandro Corichi, Sergio Dain, Olaf Dreyer, Jonathan Engle, Stephen Fairhurst, Greg Galloway, Sean Hayward, Jose Luis Jaramillo, Jerzy Lewandowski, Kirill Krasnov, Tomasz Pawlowski, Erik Schnetter, Deirdre Shoemaker, Daniel Sudarsky, Chris van den Broeck, and Jacek Wisniewski for collaboration on several of the results summarized in this review. We have also benefited from stimulating discussions with numerous colleagues, especially among them Marcus Ansorg, Ivan Booth, Bobby Beig, Piotr Bizoń, Piotr Chruściel, Peter Diener, Sam Finn, Éanna Flanagan, Jim Hartle, Ian Hawke, Gary Horowitz, Gerhard Huisken, Jim Isenberg, Pablo Laguna, Luis Lehner, Richard Matzner, Jorge Pullin, Oscar Reula, Bernd Schmidt, Walter Simon, Ken Smith, Josh Willis, and Jeff Winicour. This work was supported in part by the National Science Foundation grants PHY-0090091, the National Science Foundation Cooperative Agreement PHY-0114375, the Albert-Einstein-Institut, the Erwin-Schrödinger-Institut, the Kavli Institute of Theoretical Physics, the Alexander von Humboldt Foundation, and the Eberly research funds of Penn State.


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