Here's a pro tip for using Buzz: if you have connected Google Talk status to Buzz so your statuses appear as Buzz entries you can selectively omit gtalk entries by surrounding them with parenthesis.
By way of an example, "I'm king of the world!" will appear in Buzz, but "(I'm king of the world.)" will not.
If your first reaction is that it's unpleasant, I'd agree, that was my first thought as well. But inside Google we found that people got used to the idea. It didn't connote a temperament in our statuses, and people got used to it, just like people got used to #hash marks and @name references on Twitter.