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A few that I visit more than others:
Venkatesh Rao's ribbonfarm is usually very thought provoking. I read James Maliszewski's Grognardia for old school rpg goodness. Jason Kottke's kottke.org is usually worth a look for light-hearted things of interest. I peruse Crooked Timber when I'm in the mood for highbrow leftist angst.