U Pandita defines what he calls vipassana jhana in In This Very Life
in this chapter: http://homepage.ntlworld.com/pesala/Pan ... hanas.html
However you have to scroll down to the heading Jhana
His definition is that the jhānic factors are present, and also some insight:
... [first four jhānic factors] ...
When these first four jhānic factors are present, the mind automatically becomes calm and peaceful, able to concentrate on what is happening without getting scattered or dispersed. This one-pointedness of mind is the fifth jhānic factor, samādhi, or concentration.
It is not sufficient to have all five factors present for one to say one has attained the first vipassanā jhāna. The mind must also come to penetrate into the Dhamma a little bit, enough to see the interrelationship of mind and matter. At this time we say that access to the first vipassanā jhāna has occurred.
A yogi whose mind is composed of these five jhānic factors will experience a new accuracy of mindfulness, a new level of success in sticking with the object. Intense rapture, happiness and comfort in the body may also arise. This could be the occasion for him or her to gloat over the wondrousness of the meditation practice. “Oh wow, I’m getting really precise and accurate. I even feel like I’m floating in the air!” You might recognize this reflection as a moment of attachment.
I think that this description is useful in as much as it points out that "vipassana medition" isn't "thinking about stuff", but is about building up mindfulness and samadhi (since samadhi is essential to to insight), and samadhi requires the jhana factors.
So, as I understand it, these "vipassana" methods, are the development of samadhi and vipassana in tandem, certainly not the separation...