We would like to thank Bala Krishnamurthy, Andrew Hume, David Poole, and Oliver Spatscheck for informative discussions about particular forms of ad hoc data and potentially useful tools for manipulating that data. We would like to thank Glenn Fowler and Phong Vo for their help in using the AST and SFIO libraries. We would like to thank Mary Fernandez, Ricardo Medel, and Yitzhak Mandelbaum for their assistance in integrating PADS and Galax. Xuan Zheng implemented the histogram library.