The best of the best: TND style communities in the U.S.

Whenever I travel, I try to research the area to find some great developments that exhibit great new urbanist traits. Some are near the city center, others are greenfield developments. I get a lot of great ideas when visiting them. Since I know I miss a few good ones along the way, here is the question:

From your travels, list some developments that are worthy to be named as: Top Twenty TND's in the Nation. I am not asking that you list 20, just list a couple that you know are worthy to be on the list.

1. List the name of the development
2. List the city & State
3. State a few reasons why it is so great (and feel free to say as little or as much as you want to share.)