This could be a VERY long thread.
Here are some of the names that come up when I think of how wonderful these boards are.
First and foremost: Morrus, Piratecat, Eric Noah, all the mods but especially (for me) Darkness and Dinkeldog, though only because they're the mods I've had most contact with.
My personal list of posters who have made the world a better place in and out of the Hive (truncated list):
Crothian, Ashwyn, Maldur, Knight Otu, Sir Osis of Liver, Tallarn, Morbidity, Arwink, Capellan, Eternal Knight, Buttercup, seasong, Silver Moon, hong, KitanaVorr, Angcuru, Nifft, Horacio, Dragongirl, Mark, HellHound, alsih2o, and many, many others whose names escape me right now.
There are so many more though. I will return when I've thought of them.