Next step; wing-suit races down constructed canyon courses. That'd be fun to watch (and more fun to participate in).
@wogo: sorry for your loss, but I don't think you can blame redbull or publicity for your friend's death. Thrill seekers are always going to test the limits, and some of them are going to exceed the limits. That's just the nature of sport. And like it or not, we need people testing limits to inspire us to achieve more. People die or are seriously injured in just about every sport, and I for one wouldn't want to live in a society that didn't have that element of risk because it would mean that we weren't challenging ourselves.