There's never been a better time to install energy-efficient windows. Due to changes in tax law with the passage of the new stimulus bill, energy-efficient windows purchased in 2009 and 2010 are eligible for a tax credit equal to 30 percent of the cost, capped at $1,500. This is five times more tax credit than before. The law has some specific restrictions, which you can read at this page from Simonton Windows.
Great info, will post guidelines on my blog. For more information on the recently extended Federal Tax Credit Act for Energy Efficiency check out www.windowfactory.com!