Buzz still has a long way to go. I think there trying to ahrd to use every service to as publicity for the others. putting them all together in a way that makes them nice and easy to use is good. But some times it can get annoying when things get to tied together. cough apple cough
Any way if or when they go big scale it will be interesting to how google will approach this. Will they take after a simplicity design like facebook? Or more flashy like Myspace? And how there apps will work.