Here are a couple of links we recommend at This Is Green for further reading on Green topics:

http://www.treehugger.com/gogreen.php

http://www.pioneerthinking.com/landscape.html

http://www.energysavers.gov/your_home/insulation_airsealing/index.cfm/mytopic=11220

http://sustainablechoices.stanford.edu/actions/in_the_home/landscaping.html

http://www.greenirene.com/greenmakeover.aspx