Eight videos have been published by Google, all worth 75 minutes of Google employees speaking, from the Google Webmaster Conference event from last November.
Five tips were published on Search Engine Land from that event, but you can check out the talks themselves from that day on YouTube.
The Welcome Address
Web Deduplication
Google Images
Google Rendering
Google Titles, Snippets and Results
GoogleBot and Web Hosting
Google Knowledge Panels
Google Search Improvements Over The Years