I was on sometime recently - last night maybe - wouldn't let me stay connected for more than a few mins
I fell in some lava, realised I couldn't find my way back so had to use /back then try to jump out of the lava and put the fire out - took me about 6 tries :(
I would like to know when the Nether will be accessible in multiplayer. I would not mind so much going there if I was with some other people. Going there alone is too frightening :((