I forgot to mention this last week! Messenger:Mac 7.0.2 is now available, so go forth and download!
This update brings improvements to our support for Office Communicator Server 2007. For those of you who aren't on that server (you're just using Messenger for personal use, not in a business environment with that server; if you're on OCS 2005, you should be using Messenger 6), you probably won't notice anything earth-shattering.
Before anyone asks: I don't have anything to share yet about the public beta of Messenger which will include audio/video support for personal use. Really, the second I've got more details, I'll share them, I promise. 🙂