The idea to use kites for capturing wind energy sounds fascinating to me. Lets look what I can find on this topic:
Kites as sails for ships
Kites with generators
Ugly page by the same author with a larger scale concept
"Industrial" scale application
Lots of information on the the topic, behind a frontpage wall of uglyness.
Maybe 'the' mailing list for the topic
Summary of some research about possible methods to get energy
Another interesting system, has google backing.
PDF from tu delft describing their progress
Pointed to by the above pdf. Also by tu delft.