In a 6-1 decision announced at 10:00 a.m. today, the California Supreme Court upheld Proposition 8, a ballot initiative passed in November that outlawed same-sex marriage in the state. Here is the opinion (PDF file). Marriages performed before Nov. 4, 2008 are still valid, the court ruled.

• Day of Decision photo pool on Flickr.
• Salon’s Katharine Mieszkowski reports from Civic Center.
• 3:00 pm: The mid-day protests are now over; SFist has a list of tonight’s protest locations in SF.
• Live blog of arrests on Van Ness Ave.: SFAppeal
• Twitter hash tags being used are #rejectprop8 and #noprop8. Best tweet so far: “First Adam Lambert doesn’t win American Idol, now this?! Fuckin’ breeders..”
• SF Chronicle staff are twittering the scene on the street, publishing the stream on SFGate.
• The SF Chronicle posts the first substantial story on the ruling.
• The Day of Decision website has a list of over 100 demonstrations planned in cities across the nation, from Anchorage to Atlanta.