When i was a 5, like thouthands of little kids in the 70’s and the 80’s, i received an amazing ROTOR PLANE KITE, a Günther Flugspiele Turboplan 32 Kite (you can now buy through ebay as “old toys”…), with rotating wings, which flyes thanks to the Magnus Effect.
Today, a canadian version (quite similar to the german version) is still made : The areokite. http://www.aerokite.ca/

I guess i was not the only one how loved that kite. It is a part of a larger rotor kite family which is very great as toys but also as energy power supplier.
The toys are commonly caled UFOs Rotor kites, they are not difficult to make and are great in the sunny sky made out of mylar because they move and blinck because they are shinny. (Everything you need to know about Rotor kites is here : http://www.cit.gu.edu.au/~anthony/kites/rotor/

You can also buy then already made by the american brand PRISM as the Flip Kite :
http://www.prismkites.com/k_flip.html

The Flip kite made by Prism Kite

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Today, MAGENN and his CTO, Fred Ferugson believe in making energy with the wind with a baloon/rotor kite with less problems and costs, and more wind effective than the traditional wind turbines :

http://www.magenn.com/

And the 10Kw proof concept sponsored by the Discovery Channel in april 2008 :
http://dsc.discovery.com/tv/project-earth/timelines/winds.html