Office Communicator 2007 Beta
This news is about two months old, but I just found the beta for Office Communicator 2007 (http://www.microsoft.com/technet/prodtechnol/beta/ocs/default.mspx.) I like the interface changes, specifically the ability to add multiple people to a conversation at one time. It also only displays the name of the person speaking when the name changes. So if I send three messages in a row, my name is only written on the screen one time. It's an open beta so give it a shot if you're interested.