This got me thinking: what if instead of indicating physical presence, msn statuses were involuntary emotional indicators, like a digital mood ring. Think of the emotional energy we would conserve if we got this imperative straight out of the gate!
Available would mostly like remain as Available, but here are some others I've thought of:
Away = Distant: despite Johnny Erstwhile's proclamations that he really is looking for commitment, you know the truth.
Busy = Withholding: if you're so busy, then why are you online, douchenozzle? This will tell you exactly what kind of role you really play in this guy's life.
Be Right Back = In Recovery: He's not a bad guy, but there's been some choppy waters recently and he just isn't available right now. There is hope, however, and a potential 'WB' may be in your future.
Out to Lunch = Bat Shit Crazy: 'nuff said.
Appear Offline = Absent: it's over, dude. You're being ignored and phased out from his msn...and his life.