Lesson #9 looks at some of the Blender Scene components and how data is stored in Blender. There is also a few tutorials of common modeling problems.
09-01 - Multiple Cameras
09-02 - Multiple Blender Scenes
09-03 - Blender Groups
09-04 - Blender Display Speed And File Size
09-05 - Smoothing Problems
09-06 - Cutting A Hole In A Flat Surface
09-07 - Cutting A Hole Out Of A Curved Surface
09-08 - Creating An Animated GIF
09-09 - Binding Multiple Cameras To The Blender Timeline
Lesson 09 - 09A - Tiger Lily
Starting with a Plane object, model a wall with a hole in it, something like shown in this image. (Variation) - Instead of a circular hole, model an elliptical hole.