Here's a nice round-up of measures of sustainable or "green" cities from a number of sources. It's from Elizabeth Barrette on Gaiatribe, which is a blog "support[ing] the premise that humanity is the part of the biosphere that can think, which gives us the responsibility to care for life and the Earth. Here you'll find discussions of renewable energy, sustainable development, intentional community, nature religions, environmental awareness, and related topics."

The list provided is a quick overview of a number of resources and indicator sets to look at urban sustainability. Take a look, and let me know -- which other resources should have been added to that list?