This video is from 1968 but it is still a fantastic summary of the main principles or aerodynamics. It contains some wonderful wind tunnel footage and serves as a good 20 minute refresher on the main points of aerodynamics especially at PPL level.
Well worth watching.
[center][video] http://www.youtube.com/watch?v=_LXW3pHNn_U [/video][/center]
FAA training videos are always full of solid info, though some of the older modules can feel a bit slow-paced when you're trying to power through ground school material.
If anyone finds the pacing a bit slow while studying, playing them at 1.25x or 1.5x speed makes a huge difference. For downloaded offline clips or local video files, using something like Zimblu Video Speed Changer works well to speed them up before watching.