Ashamed to say still Slashdot, have it in my RSS, old habits die hard. Otherwise various reddit subs since people are quick to post breaking news in whatever field I'm interested in. Then a bunch of newspapers/sources from around the world to try and get a balanced overview of things.
What happened to the comments? Fifteen or so years back you would read things which were occasionally insightful. Now it's mostly shit posting.
There's still the occasional insightful comment or discussion, but mostly it's useless. Like a lot of stuff in my RSS the headlines are enough.