First off, sorry if none has touched this thread in a while. Saw the MMO question and had to answer.
The most recent one was the Elder Scrolls Online beta, but I doubt I'll be giving it a proper go. I enjoyed Skyrim and what of the beta I got to play seemed decent for beta (sadly, I kept having login issues. Last two beta plays I just didn't bother). Been watching a playthrough online and it looks beautiful. I just don't want to pay the subscription fees for it.
I've considered going back to Everquest, which one the first MMO I played and my favorite of all, but it's changed so much I don't even recognize it anymore. At least it's free.
There's others out there, but I doubt I'll find one that gives me the enjoyment or experience pre-Luclin EQ had. Still say that version of the game was the best MMO ever released.