Can the iPhone solve global warming? Probably not, but this unique little calculator app will tell you how hard an appliance will hit your energy bill before you buy it. It also makes it possible to calculate the amount of greenhouse gases an appliance will produce in the environment.
iPhone link: http://techlogg.com/gcalc2/gcalc2.html
Web site link: http://techlogg.com/content/view/261/1/