I play World of Warcraft in addition to WoW for the computer, and I might try a game my buddy has that is some sort of sci fi single player space game, it looks pretty fun, for an offline game.
For xbox I play Halo 3 with my buddies, but I don’t really like h3 as much as i had liked h2 back in the day. I kinda burnt myself out on all the good 360 games that I have played, and own, having played it so much since the 360 game out, cod4 is a pretty fun one.
For muds, MD is far and beyond all the other ones i have ever tried, but I also used to play one called New Worlds, which is a roleplaying mud, and sometimes i drop in there for some fun RP.
For the most part, i’m either playing MD, or doing pvp on WoW =)