http://www.chessclub.com/uscf
The rated blitz games have been going on for a handful of months now but the 12+3 quick ratings are new. Just thought I would spread this as it's extremely convenient for a lot of US players.
Of course, with the cat out of the bag now, I'm wondering when they're going to go live with rated online regular games of like 45/5 or whatever they pick.