Acknowledgements

We acknowledge the very generous advice and assistance, over the course of the last half a dozen years, of D. Alvarez, K. Coble, D. Cottingham, P. de Bernardis, M. Devlin, S. Dicker, M. Dragovan, K. Górski, S. Hancock, E. Leitch, M. Lim, P. Mukherjee, L. Piccirillo, S. Platt, T. Readhead, G. Rocha, J. Ruhl, R. Subrahmanyan, N. Sugiyama, E. Torbet, G. Tucker, and especially K. Ganga, G. Griffin, J. Gundersen, B. Netterfield, S. Tanaka, as well as L. Page. We acknowledge support from NSF CAREER grant AST-9875031.