i really miss tabs that showing me the status of the session (especially a "activity indicator" for sessions in background!). i seen this feature on SecureCRT.
SecureCRT has the following states in his tabs:
green symbol: session os online, nothings changed...all is ok
red symbol: session is offline
blue symbol on tab without focus(in background): something has happend in this session (very useful when you wait for an event without permanently having a look to a session)