Agreed - otherwise the isolation would just be too much, this way I an see if anyone besides people on my friends list are online, and we can all just group chat. Good way to keep the community in the cohesive.
Teamspeak might be nice, but I can't see it getting used for much at the moment, at least where Skype wouldn't suffice, as we don't have any group activities that require that sort of communication/co-operation. Could be good though, still.