Instead of choosing favorites I'll say something good about some of them:
Likaon_kter: Pro Linux!
Guy N'wah: knowledgeable and helpful. Pro Linux!
Second Children: funny without trying. Geeky and friendly.
Dragonbird: great, smart sense of humor.
Dona: friendly and likes adventure games.
Gregski: introduced me to Polish vodka and how to drink it, though he probably didn't know that.
Tommy: incredibly dedicated. Must be all that coffee. Also tells great jokes.
Corylea: funny and welcoming, always trying to be nice. Pro classic RPGs.
ReptilePZ and Sydspiker: somehow became the forum clowns we needed.