Great Sites on Recycling
Good general recycling site with information on plastics, glass, paper, aluminum, etc. http://www.epa.gov/grtlakes/seahome/housewaste/src/recycle.htm
Good site on PET plastics http://www.napcor.com/learn.html
Slideshow of HDPE recycling http://www.handsonplastics.com/hands_on_plastics/pdf/hdpe_slideshow.pdf
Information on plastics recycling rate http://www.plasticsresource.com/recycling/recycling_rate_study/
Physical properties of several plastics http://www.dow.com/engineeringplastics/tech/guide/display.htm?guide=propert
Physical properties and manufacture of aluminum http://www.webelements.com/webelements/elements/text/Al/key.html
Physical properties of aluminum, iron, plastics, glass, paper http://www.ogden-mfg.com/tech9.pdf
A great chart on benefits of recycling http://www.umass.edu/recycle/environmental_benefits.html
Environmental benefits of recycling by state http://www.nerc.org/fsheets/