http://www.youtube.com/watch?v=TSVQhhEt7tQ&feature=related
Here's what the original Buddha talked on the topic of Samatha and Vipassana.
Formally, there are sixteen stages — or contemplations — of Ä�nÄ�pÄ�nasati. These are divided into four tetrads (i.e., sets or groups of four). The first four steps involve focusing the mind on breathing, which is the 'body-conditioner' (Pali: kÄ�ya-sankhÄ�ra). The second tetrad involves focusing on the feelings (vedanÄ�), which are the 'mind-conditioner' (Pali: citta-sankhÄ�ra). The third tetrad involves focusing on the mind itself (Pali: citta), and the fourth on 'mental qualities' (Pali: dhamma). (Compare right mindfulness and satipatthana.)
Any �n�p�nasati meditation session should progress through the stages in order, beginning at the first, whether the practitioner has performed all stages in a previous session or not.[citation needed]