Many of us are interested in salvaged materials, using reclaimed lumber, etc.
I found this on the web. I haven't looked into it deeply yet but it looks interesting!
http://www.gvrd.bc.ca/BUILDSMART/pdfs/OldtoNewDesignGuideFull.pdf#search=%22michigan%20salvaged%20building%20materials%22
Many times I design around what I have rather than specifying what used materials I would like to find. Always look at salvage materials with an eye to the future.
Good info, Miedrn. :)