This is a presentation given at WordCamp Seattle 2011. The title of the presentation is "Advice for Selling Themes" and covers topics including marketing, theme anatomy, support and other related topics. Some of the marketplaces discussed are ThemeForest, WooThemes and Mojo Themes.
Chris' work can be view on ThemeForest under the username 'themolitor': http://themeforest.net/user/themolitor?ref=themolitor
Clipping is a handy way to collect important slides you want to go back to later.