Maitreyee Manglurkar has 23 July 2009, very well described what it's all about:

"Street photography – as the name suggests – literally means shooting on the street. It may be regarded as a close relative of documentary photography. However, there is more to it than just picking up your camera and clicking images on the street. The basic idea of street photography is to capture life in its candid moments. Call it a voyeuristic documentation, if you will. And easy as it sounds, there is a technique and logic behind it as well. And it’s not all about being trigger happy all the time." Hope MM will stumble across my book City Folk one Sunny Day :-)