I was doing a form of multiboxing whenever Shadowbane was around. But I used some horrible hacked up chinese script program to ... uh... automate my other characters. So essentially I could play 6 acocounts at once and use it to powerlevel my main account or friends characters with like 4 druids and a bard and a priest and then the lowbies.

Shadowbane had formations too which made moving shit around really easy and the other players casting wouldn't break formation, only if they tried to move.

I ran multiple accounts in UO as well but once again not really multiboxing.

I hardware boxed for the last half of TBC. Still have all my Vetras and about 4 billlion ps2 cables....