001 : No advertising, please. Linked names are fine, but I don't want to see people say "Hey! Look at my site! It's great... [generic advertising crap]." There's a specific subforum for advertisements, so keep it in there.
002 : Don't spam/flood. In essence, they're the same thing. It's... basically, posting a bunch of pointless messages over and over. The Cbox automatically bans your IP for a short period of time if you get up to a certain amount of posts with no one responding, but until that certain point, there's no automatic flood-preventer.
003 : Be kind and respectful; not only to your admins, but to all members/visitors of the site. Respect the site, as well. Don't be a jackass and post an anonymous insult, especially. That's just cowardly.
004 : No roleplaying in the Cbox. That's what the forum is for, kiddos. c:
005 : Don't quarrel in the Cbox. If you and another user have an argument to settle, kindly take it to PM or some sort of outside form of communication. It doesn't look good, and I'd rather not have everyone tangled up in the mess.
006 : Do NOT impersonate any other member. This is one of the more penalized rules, if broken. Just don't do it. I know the IP addresses of all of you, so don't even attempt it.

NOTE : In all honesty, I don't care if you use chatspeak in the cbox. It's a chatbox after all, so you can let loose if you'd like. Just keep it out of roleplay... and please don't 7YP33 LiiK3 DiiS.