What is meant by the 8 stages of insight? I have heard that there are 8 attainments or stages of insight in the progression of Vipassana, can anyone explain? I'm familiar with the 8 stages of jhana but I believe this is in reference to vipassana specifically.
This is 7 purification and 16 stages of insight. See:


The Progress of Insight
Transcendental Dependent Arising
Relay Chariots
7 Stages of Purification &amp; The Insight Knowledges
A Map of the Journey (Very readable book)
The Development of Insight
The Sixteen Stages of Insight


NB: Don't get too engrossed in the stages. Many of the naturally manifest them self. You cannot force the development or crave for it to come. Either way you are regressing.