The Energy tax credit has been extended through 2010, nearly everyone can benefit from this credit, as most homes can use extra weather-sealing, and insulation improvements.  The tax credit is a 30% credit of up to $5000 in total investments which will give you a $1500 break on your taxes.  It is a one time credit so you can not double dip with separate $5000 projects.  Here is a link to the Energy Star page which further outlines the details of the program.

Energy Star

We just completed a weatherstrip retrofit on a custom door opening in a home, the new doors had been installed in an existing opening with old weatherstrip which was not performing well.  We custom made new hardwood stops from Blue Star FSC Certified Red Meranti, and installed Resource Conservation Technology Weatherstripping to seal up the door opening.  Check out the video detailing the installation.