Here's a 55 minute tutorial about the awesome new Polygon Pen tool. (Replaces Create Polygon tool). Brush on polygons, tweaking points, edge and polygons without changing mode, extruding, auto welding points and edges, basic knife cutting, subdivide edge, curve edges and more. This video covers the Polygon Pen tool's entire functionality.
This tutorial is hosted on Vimeo. Clicking on the download link will take you there. You will be able to download the original high res version rather than watching the low quality streaming version.
Update: I've added a short section on deleting elements and using the tool with dynamic guides.