One of my favorite websites, Worldchanging is building out it's local sites. When I'm not here at TOD NYC, Upper Green Side or Streetsblog I will no doubt be over at Worldchanging:NYC. Over there you will see how the environmental/sustainability movement has changed from a bunch of hippies on an organic farm (not that there's anything wrong with that, if that's your thing) to a modern, sustainable design-oriented folks that leverage all the resource saving environmental advantages of the dense urban environment and modern technology. Here is there motto:

Worldchanging was founded on the idea that real solutions already exist for building the future we want. it's just a matter of grabbing hold and getting moving.

They are also going to be here a few times this month promoting their new book.