Some interesting research out there on suitable materials for house building. The table is from a pdf on external insulation systems (published by the Energy Saving Trust) and highlights the environmental vlaue of various materials and systems (A being good C being poor). The most interesting thing about it is the number of categories considered: 17, ranging from recylable to amount of embodied energy and life span.
This system was developed by BRE.
Here is a very good article on the value of blown insulation (in this case highly efficient polyurethane) over fixed panels or batts. I was directed to this based on an aretcile on R-values on Wikipedia, otherwise I can't verify its accuracy.
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