Because surfing on a wave of air is so far out of the range of ordinary experience, videos help convey what it's about. If they don't play when you click them, try right-clicking and "Save Target As..." then remember where you save it.
Why not start where I did, with this segment from PBS's Scientific American Frontiers with host Alan Alda? Most of the hour was about the father of human-powered flight, solar-powered flight and all around inspiration, Paul MacCready. This particular clip is about his son Tyler MacCready and his walkalong glider (keeping it up with his head)! Here is YouTube link http://youtube.com/watch?v=S6JKwzK37_8 Some schools block YouTube, so here is a more compressed file if the other link is blocked. It's about 3 1/2 minutes long and about 5 MB file size.
Here is short clip at normal speed of a student at the middle school where I teach flying a tumblewing through our video lab. The tumblewing is a good design to start with because it moves slowly. About 11 seconds and 476KB file size.
Here is a slow motion segment of the previous piece as the student goes past. Notice how the tumblewing in such a way that if it were a wheel on the ground, it would be rolling backward. It is important to be aware of that spin direction because when you launch a tumblewing, you need to give it a little push in that direction to get it started. 280 KB and 14 seconds.
Here is a slow motion clip of me flying a giant tumblewing to show clearly how it turns and its position relative to the cardboard paddle. About 10 seconds long and 170 KB file size.
Here is another slow motion clip of a student flying a tumblewing. It is a little dated because now I encourage students to fly larger gliders (easier to make and fly) and now I encourage people to hold the cardboard on the sides with both hands for greater control. However, I still like the clip because it captures how I created (unlelpful) turbulent air currents when I walked in front of her, and yet she regains control. About 356 KB, 30 seconds long
After you master the docile tumblewing, you can explore faster aircraft—like this jagwing which was also developed by Michael Thompson —on Phil Rossoni’s excellent walkalong glider website http://www.geocities.com/x_surfer2004/
Here is an amazing video of a height event from David Aronstein and the Kansas group http://youtube.com/watch?v=QwRyNZE4YKE
There are more short videos in my how-to make and fly instructions, but they are specific, such as how to launch the tumblewing.