Well let's see if I can think of who's left..
Ralren's quit for about the 5th time, possibly for good but that's what we say every time.
Fire's gone which is a blessing in itself
Dragonboots is pretty much inactive now but he still logs in
SP's quit in dramatic fashion as you might have seen
Merlinoboy stopped coming back for the time being (were you even here for his saga?)
Rootan's still around, but she's fairly well behaved now.
T-Jack is gone as well, but I can't recall if you were here for that or not.
edit: Fab left, but he came back like a week ago.
Apart from them, I don't thing anybody especially memorable has left that wasn't already long dead.