The Flex Your Power website is one-stop-shopping for energy efficiency. It's meant for Californians, but it's a powerful resource. On it, you'll find: How to buy the most efficient washer and dryer, dishwasher, refrigerator, furnace, air conditioner, and hot water heater; how to light your home with natural light and compact flourescents;
how to insulate and weatherize your home and cool your roof; how to save water using ultra-low-flow showerheads and toilets;
how to find and qualify for rebates and tax credits and the like; and how to get a home energy audit, find classes and trainings, get free project design assistance, and find demonstration models in your area. There are even tips on how to start if you're on a tight budget. Every state, province or city in the world ought to have its own version of this wonderful site.