I think Mac users are already used to see Mac name in the end of update list for software companies. But anyway they somehow can see some improvements and Yahoo just made one. With new messenger, which currently is in beta, you will be able to make PC-to-PC or PC-to Phone voice calls.
With the new update there will be also free voicemail and call forwarding. But to use call forwarding and also PC-to Phone service you will need Phone Out account. How you can see rates are pretty low and I think the service will find it’s users.
Here is a screencast to see all that stuff in action: