Found the links for the "Web App Autopsy" and also a related talk, & link to the 2nd talk's slides (original links to the slides from RWW are broken):

http://particletree.com/features/web-app-autopsy/

http://www.readwriteweb.com/archives/sxsw_the_figures_behind...

http://www.slideshare.net/dcancel/barenaked-app-the-figures-...