Resources:

hardwood
http://www.floorfacts.com/hardwood-floors/wood-floor-finishes.asp

general
World Floor Covering Assn.
http://www.wfca.org/

recylced flooring
http://www.builderonline.com/flooring/flooring-industry-puts-recycled-materials-to-work.aspx

laminates and wood flooring
North American Laminate Floor Assn.
http://www.nalfa.com/

general, exotics
Country Floors
http://www.countyfloors.com/index.html

cork, bamboo
http://www.usfloorsllc.com/

carpet
Carpet and Rug Institute
http://www.carpet-rug.org/

general
http://www.armstrong.com/flooring/floors.html

pricing
http://www.costhelper.com/cost/home-garden/tile-flooring.html

pricing, general
Lowes
http://www.lowes.com