Energy-saving products site
If you've been thinking about switching to compact fluorescent lightbulbs and rechargeable batteries, water-saving (but high pressure) showerheads and energy-saving power strips (recommended for all us computer-using geeks), check out Earth Aid Kits. You can put together a kit of 4 or more categories of items (each thing I mentioned is a category, for example) and save a huge amount on the price of each item and on shipping. And the site tells you how much you're expected to reduce in carbon emissions and save on your utility bills in a year because of using your kit, as well as how long it should take for the kit to pay for itself. I definitely learned a few things from the site. [/advert]