I was intrigued by how the sport had developed so I researched the early history of kites and kitesurfing and wrote the history section of the Wikipedia article on kitesurfing and added a lot of additional content to the article. It is amazing how far and wide this content has now been copied!
Recently, Stuart Webb found this video which has interviews with many of those who figured prominently in the development of kitesurfing, including Cory Roeseler and Flash Austin. It is well worth viewing.
I have also written this article on kitesurfing history on our Kitesurfing Handbook and included a link to the the video.
Let me know if you have any more kitesurfing history that should be added.