Liquid Image is an action cam company that I know best for its ski goggle cameras. Any camera-maker that specializes in building cameras into goggles knows how to make 'em small.
The new Evo cam is a mountable HD camera that offers a nice set of features for solid price. The camera is just 1.6 x 1.2 x 2.5 inches but still packs an LCD viewing screen. It shoots in up to 1080p at 30 fps and uses Wi-Fi for instant content streaming. It films 136 degrees of action and mounts to equipment like bikes and boards. It also shoots still pictures at 12 megapixels.
The Ego will hit the market in June for $149.