There's one over on Feathermoon called Enduring Nobility for the Alliance side (though I'm not sure if it's still active). I was a member before I had to leave the game, and they are a great group of folks. I thought I recalled someone starting or planning to start a Horde version as well.
Currently, most of the people who were very active in the guild are busy, so there's not much activity there these days, I'm sad to say. There's also a horde-side version, also on Feathermoon, called Eldritch Night, that's also not very active any more.
I see a light at the end of the tunnel for some of the busy problems. We had three different households moving at one time, which was brutal. Two of the three are back, although one of those two is trying to tempt everyone to play hordeside....
Please do check out the hosted forum for a better idea of what is going on, and who to look for on line.