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.
I kept going for way too long before shifting to hn. The comments on slashdot were so adversarial that whatever you post expect to be called an idiot. Plus having to scroll past the ASCII art swastika every day got to me and I wouldn't want my wife looking over my shoulder.