The GoPro Digital Hero line of cameras are designed to make capturing photos in the midst of sports activity easy. The cameras strap to the wrist, locking flat when not in use and pivot up, when you're ready to take a shot.
The new US$139 Digital Hero 3 has been bumped up to 3 megapixels (skimpy by today's standards, but this is a specialized device). The camera supports SD cards up to 2GB and has modes to capture 30fps movies and 3X sequence photo bursts. Like its predecessor, it weighs 4.5-ounces and comes equipped with a shock-proof/100' deep, water proof polycarbonate casing.