The new energy tax credits are out and if you want to know what and how to buy to qualify for them then check out this site. It is a slide show with energy tax credit information on windmills, heat pumps, roofing, solar and more.
http://www.treehugger.com/galleries/2009/02/stimulus-tax-credit-guide-obama.php?page=1
http://www.treehugger.com/galleries/2009/02/stimulus-tax-credit-guide-obama.php?page=1