Mountain Lion Messages

     Jim Hamm's impressed with Verge newsletter info on Mountain Lion;  he notes their comments on Messages, saying, "How Messages works is a bit confusing. Read the fourth paragraph. Looks like iOS 6 will solve the problem later this year when it's released."
        You'll want to read their whole report on all the features.  The Verge gives 11 pages of illustrated info on Mountain Lion, followed by 757 comments.