The Chronicle of Higher Education's Arts & Letters Daily is an unbelievably wide-ranging smorgasbord of new articles and essays for thinking readers—sort of a modern Reader's Digest for educated and curious people. The pieces have been published in literary magazines, popular magazines, and newspapers from all the world's English-speaking countries. There's also a constellation of blog links (left-hand column) that the editors have found to be worthwhile.
This is like browsing the periodicals room of a really good library. Only trouble is—three hours later you come up for air and wonder where the time went.