Acknowledgments
This paper was first presented at a special session at the annual meeting of the Association of American Geographers in New Orleans, March 2003. I would like to thank Daniel Sui for inviting me to participate in the session, the audience and panel members who asked provocative questions, the paper's five referees, Waldo Tobler for granting me an interview, and Kevin Gould, Geoff Mann, and Joan Seidl for useful comments and suggestions.