Google has made available a recent Hangout on Air with a couple of Googlers from the ecommerce team, who discuss some conversion and optimization tips for ecommerce AdSense publishers.
They walk you through a presentation on how to make the most of the holiday season. More specifically it gets into creating a user-friendly experience, and capturing mobile opportunities, as well as improving profitability through advertising.
The video is about a half hour long.
In related news, Google announced the launch of a new mobile anchor ad for AdSense on smartphones. With this, ads will be anchored at the bottom of the user's screen as they scroll, unless they dismiss it.