>
trends.google.com.au/trends/?q=windsurfing,+kitesurfing> nuff said
Windy geez thats awesome I never saw that chart..

Okay then,
Lets put it into perspective.
Lets look at adwords folks, not search results. This is how many searches are made on a certain key word and not how many results show.
This is how many unique searches are made:
Kitesurfing 550,000, Windsurfing 823,000
Kitesurf, 673,000, Windsurf 673,000
Kitesurfers, 1,300, Windsurfers 12,100
kitesurfing photos 480, Windsurfing photos 590
Kitesurfing videos 1,300, Windsurfing Videos 1,300
kitesurfing school 720,Windsurfing school 2,400
kitesurfing tricks 880, Windsurfing tricks 1,600
kitesurfing spots 1,600 Windsurfing spots 1,000
Learn kitesurfing 880 Learn windsurfing 880
I can put more any other words I should compare? :D