Vipassana is one of the world's most ancient techniques of meditation, the inception of which is attributed to Gautama Buddha. It is a practice of self-transformation through self-observation and introspection to the extent that sitting with a steadfast mind becomes an active experience of change and impermanence. In English, vipassanā meditation is often referred to simply as "insight meditation".[Src: http://en.wikipedia.org/wiki/Vipassan%C4%81 ]
The focus is on observance of breath. The main precepts aim to enable non-identification with body and non-identification with mind.
Refer to http://pldhar.wordpress.com/lectures/ for more literature on this form of meditation