This is a talk I presented on July 26, 2001, at the Centre for Mathematics and its Applications, Australian National University. I presented an abbreviated version on August 8, 2001, at the 2001 Joint Statistical Meetings in Atlanta, GA.
The talk is available in postscript and pdf. The text slides may be downloaded either at full scale (33 pages) or reduced 4-to-a-page (9 pages). The figures need to be downloaded separately. Those noted as color will be much more effective viewed on screen, or printed on a color printer.
Note: At this point, the figures are a mix of letter and A4 sizes. If anything doesn't print well for you, let me know and I'll try to put up a corrected version.