Here's a thread to post up what muds you're playing lately, if you feel like maybe having some fellow MBers drop in (or I guess any multiplayer game, but this is a mud forum right? :) ).
I just started playing ASSAULT: High Tech War for the first time. Base building (so much fun) and PVP. Sniper Rifles. Nukes. Tanks, mechs, planes. Bio weapons. Hacking. A full underground with magma. Outer space. I'm having more fun on a mud than I've had in a long time. Come check it out!
It's a little overwhelming at first (at least for me) but people on the newbie channel are pretty good about answering questions.