EVE Online
I started playing this last weekend, when the dreadful weather prevented me doing anything else. It's a space MMORPG and it's a quite a bit like that golden oldie Elite, except it's massively complex. In fact it's almost overwhelming at first and I would have given up within a couple of days, but for the weather and the fact it's free for the 1st month. I'm still not sure if I like it, but I'm compelled to keep going.