If you're too lazy to sign off, duh
I haven't been on MSN much lately but I do get on every now and then. I appear offline when I'm avoiding someone or when I feel like playing ghosty. If I'm on "away" it means I'm away from the computer and will be for a long time. "Busy" is only put up if I'm on skype and I set the window to full-screen. "Be right back" if I'm going to the bathroom or getting a quick snack.
Yeah, that's about it.
Oh, and I'm ALWAYS signed into skype, because I use it every day. AIM, I'm barely on as it doesn't work for me. Trillian won't connect for me anymore either, so I suppose it's time to find a new program that's similar so I can sign into all my messengers at once and not have a clutter of windows.