The Arts & Letters Daily website is a great source of interesting and, often, erudite articles. Sources are eclectic: I've seen articles from the London Review of Books, The New Statesman and The Irish Times.
It's updated every day, as its name suggests, and I try to "pop in" at least once a week. Sometimes there is an article or two concerned with writing, but more often than not there isn't. But they are always well-written and thought-provoking.
And, let's be honest: that, plus a decent cafe, is pretty much all we writers want!