James Howard Kunstler
I know about Kunstler from a book that's been on my "to read" shelf for the last couple years, called "The Geography of Nowhere." It's all about how screwed up the American way of urban planning is. The book is supposedly very radical and full of gloom and doom.
I've just discovered his website (thanx ken) which has all sorts of interesting things, including various characteristically dark and forceful rants. Particularly interesting is his eyesore of the month page, and his Clusterfuck Nation Manifesto.