should be a bit more organized. I think the list should show all the people online at the top and offline at the bottom. It's usually how friends lists work. I cannot imagine when I somehow manage to get 50 friends and I have to scroll all the way to the bottom to send an invite.
This isn't a real big issue but something that would smooth things out a bit more. I'd rather see other things done first but keeping this in mind would probably be helpful.