on roster window when contact sent us a new message, it should have a icon saying that
contact should have an icon (not necessarily an animation) in the right side of the name if possible. else just replace that status icon with the icon of the "new message"
also contacts that leave before being removed should get a gray bg color for 5 seconds. and contacts that just go online should be shown and should have a green bg color for 5 seconds. {gossip inspired}