Example 1:
"Hey guys, there is some rich noob in the shop and I want to go kill him and steal whatever he's got on him. I don't know if he can fight, so why don't you three log in too so we can pwn him?"
"Sounds fun. We're in."
*All 4 characters are suddenly ingame, surrounding the shop. They somehow all know they are going to be attacking the same guy. They do indeed 'pwn' him and take all of his belongings.*
Example 2:
"You logging in today?"
"Yeah. My character will probably be doing some mining, like he usually is. *wink*"
"Right. Well, I'll be ingame. My char's usual spot, like you would assume."
"Alrighty."
*The characters eventually meet ingame and roleplay it up.*
.....
There is extreme use of OOC knowledge in some MSN/AIM/whatever chats and obviously, that's fine. Until that knowledge is used ingame. Example 1 shows how you SHOULDN'T use it. Do we know what you're talking about on MSN? No (unless you look in the quote-of-the-day thread

). But it's still against the rules to use OOC knowledge IC.
It does indeed get annoying when you can't find anyone ingame. But the island of Gobiath is tiny and we can't quite explain some long-distance way of communicating other than 'sending doves' and runners. Just establish a common meeting spot with your pals, I suppose. The tavern and outside the shop are great examples of this.