Falling Whistles
Falling Whistles sells whistles for $34 to $104 to raise money for education, advocacy, and the rehabilitation of war-affected people in Congo. The organization got its name from a journal written by its founder, sharing his experiences during a trip to eastern Congo in 2008. During that trip, Falling Whistles' founder met a group of five former child soldiers who told him that some children who were too young to carry weapons were sent into battle armed only with whistles. By wearing whistles, the campaign aims to use this weapon as a tool of protest and to raise awareness of the situation in Congo. As of September 2010, $500,000 has been raised.
Nose whistle
A nose whistle (also called a "noseflute") is a wind instrument, usually made in wood, but also available in plastic, clay and sheet metal, probably of South-American indigenous origin. In spite of its ethnic background, several models have been conceived and patented in the 19th and 20th centuries. 
The nose blows air into the instrument's open nosepiece, from where it is channeled through an airduct, towards a rather sharp edge of a slit, positioned over the player's mouth opening. This edge helps creating a vortex that excites the acoustic field into the player's mouth cavity. Since the volume and shape of the mouth cavity can be widely and quickly controlled by the player, a wide range of playing frequencies are possible. This high playability of such sound instrument probably explains the fact that it is usually called "noseflute", rather than nose whistle.