Over on New York Times $elect, Steven Johnson — author of Everything Bad Is Good for You and the just-released The Ghost Map — is writing a blog called "Urban Planet":

Over the next month, I’ll explore the many facets of our urban planet and its future, drawing upon the themes that were visible, in embryo, 150 years ago in the streets of London: the peril and promise of density, local knowledge, the importance of public health systems, and the strength of neighborhoods. I look forward to hearing — and responding to — your own stories and reflections on urban life.

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Too bad only a tiny fraction of you can afford to read it.

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