I seen a couple of shows that were pointing newspaper as a very good insulator, that attracted my interest so I was wondering if any of you have any input on this?
If you really want to do it yourself:
It is extremely important to treat newsprint with fire-retardants before using them as insulation. Without treatment, newsprint stuffed into wall cavities or attics is a serious fire hazard.
A better option is to simply purchase cellulose insulation. It's made from recycled newspapers and is treated for proper fire resistance by the manufacturer. In my opinion, it's safer and more sustainable to confine the chemical treatments to a factory rather than your personal garage, yard, or workshop.