UPDATE #1: NYT's Frank Bruni, who came out quite some time ago, with moving column tonight.
MLB players applaud. Not a given.
Earlier: Just posted by Sports Illustrated. It's center Jason Collins and he writes first-person account.
"I'm a 34-year-old NBA center. I'm black. And I'm gay.
"I didn't set out to be the first openly gay athlete playing in a major American team sport. But since I am, I'm happy to start the conversation. I wish I wasn't the kid in the classroom raising his hand and saying, 'I'm different.' If I had my way, someone else would have already done this. Nobody has, which is why I'm raising my hand." And he'll be marching. "The recent Boston Marathon bombing reinforced the notion that I shouldn't wait for the circumstances of my coming out to be perfect. Things can change in an instant, so why not live truthfully?"
Kobe Bryant says he's "proud" Collins came out. Bill Clinton tweets that he's proud to call him his "friend."