MeFi has seen a GoPro camera attached to a sword, but after running across a video of one attached to a Hula Hoop (it'll make you dizzy) I decided to look for more and found a trove of sports, most of which are created by GoPro and as such may come across as advertising, but some are independently shot, so put that aside if you can. I'll probably never take up any of these activities, but I get an idea of what they're like via helmet or pole-cam. There's the Base Jump; the GoPro at 80,000 feet (near space); Boogie Boarding Surf; Surfing; Racing up Pike's Peak; Mountain Biking; a Kayak Competition; Kiteboarding; Longboarding; the 2010 Highlight Reel and many more. Damn, now I want one!
Jet Sprint: Jetsprint racing is a small V8-powered jet boat with a crew of two (a driver and a navigator) who must negotiate a set course through slough channels 12-15 feet wide and 3 feet deep at speeds up to 80 mph. The winners are those with the fastest times; the losers often don't even finish. [more inside]