I recently attended one of those "get two free nights at a resort for listening to our sales pitch" meetings. The majority of their focus was on this waterless, greaseless cookware that was really nice. Although they were not intentionally being "green" in their show, it appears to me that there is an advantage to this type of cookware, even if it is pretty pricey.
It is all very nice stainless steel with some other fancy metal layers on the inside, they have special whistle lids that notify you when your food has reached the ultimate temperature to kill germs but not the nutrients. The lids also create a seal so that after the whistle sounds you can pretty much turn the burner off and your food continues to cook, so you never use a setting above med-high. Another cool feature is that it is all uniform thickness for even distribution of heat which means you can stack the pots on top of each other and cook several things on one burner. And as mentioned before, you can cook without water or grease added. (although for veggies it works best if your vegetables are frozen)
Now I know that sounded like a sales pitch too, but I think these features are really nice. I have heard a lot of talk about the dangers of non-stick and aluminum. In fact, I have even heard that the US is one of only a few countries that haven't made selling aluminum cookware illegal.
So I wanted to start this forum to discuss what you have heard about different types of cookware, what is dangerous to our health, what saves energy, water, and time? Are there any other cool things you have heard of?