Saul Griffith has just released WattzOn, a personal footprint calculator that allows you to account for everything in your life – including taxes and the embodied energy of the products you own. You can then compare your impact with other people in the world and start to understand how much alternative energy is needed to compensate for your energy footprint. The site has a number of unique features, primarily the use of a single measure – watts – to account for environmental impact. There is also the ability to calculate the impact of specific (even custom) products and these lovely visualizations, such as the windmill you need to neutralize your consumption.