June 30, 2014 — In this session learn how to build your first WordPress widget. It goes step-by-step through the best practices for building a simple widget, talks about different existing widgets and some possibilities for new custom widgets. It discusses when a widget should be built into a theme or plugin, and when a widget should be its own plugin.
July 10, 2010 — This is live WordPress development without a net. Alex King and Shawn Parker from Crowd Favorite take you through the full process of creating a new feature/add-on/customization for WordPress; from concept to architecture to code.
January 12, 2009 — Widgets let you customize the content that appears in the sidebar(s) of your blog. This video walks you through the basics of adding widgets.