I've been using the (old) Meebo Messenger for years. I've never had the impression that they cared about its users a lot. There were no updates on the user interface since I began using it, they didn't add features that were highly requested on the feedback forums.
The toolbar thing is just... I don't know what that is. Looks useless to me.
Another thing, are there any good other web based multi messengers? I guess they will shut this down soon then?