A few sites from my newsfeed (I use Newsblur):

    Hacker News (of course)
    LWN
    Ars Technica
    Angry Asian Man
    Climate Denial Crock of the Week
    Cool Tools
    Council of Ex-Muslims of Britain
    ESA Top News (Euro. Space Agency)
    Jewish Daily Forward
    Jonesblog (retinal neuroscientist and photographer:http://prometheus.med.utah.edu/~bwjones/about/)
    NASA Image of the Day
    Physical Review Letters
    Not Even Wrong
    Planet Clojure
    RealClimate
    Retraction Watch
    New York Times
    WTOP (local news)
    Schneier on Security
    Slate Star Codex
    Space Safety Magazine
    CDC's Morbidity and Mortality Weekly Report (highly recommended)
    Stories from the trauma bay