No offense, but mibbit is for idiots.
Use irssi or xchat.
Use irssi or xchat.
How is Mibbit for idiots? It lets me give URLs to people who want to join chat rooms, so if I want to invite somebody to a channel I don't have to say "Download this, then fill out this and this and this in the boxes," I can just link them and they click it and they're in. I can style it to my heart's desire. It's customizable as anything. It supports tabs for multiple rooms at once.
I do use Colloquy or irssi when at home, though.