Not something I've ever thought about before but what a great way to take pictures - hitch your camera to a kite, fly and shoot.
Of course, there are some thorny technical issues involved but there's a whole slew of online resources available - if you're interested then KAPER E-magazine is a good place to start.
As well as offering tips, links and technical information, KAPER has a number of gallery pages that are worth checking out - I especially liked this collection from Chun-Yen Chang.