It used to get kinda lonely out here, but it's getting less and less so. Here are some references to like-minded groups. If you know of some others, please let us know. Local friendlies in the good fight:
Washington State Department of Natural Resources Master Gardeners of King County Seattle Tilth Association EarthCorps
Elizabeth Miller Plant Answer Line Seattle Public Utilities Community Resources Division International Society of Arboriculture Pacific Northwest Chapter Seattle Transportation Urban Forestry Program King County Department of Natural Resources Reusable Building Materials Exchange
And these are allies further afield: