Tried Buzz today... My question is why we need yet another "status" service...
Well, anyway, I am using it. LOL. It's nice for it to have easy importing from other content providers like Flickr, Blogger, Twitter, and etc. It doesn't require (or allow) you input credentials for imported (they called it "connected") sites, therefore only public content will be imported. And that's why my Twitter feeds aren't buzz-ed.
Also noticed that comments & follow-ups would be sent to your inbox automatically. I really wonder why this is needed when the Buzz link is directly below that of your Inbox. Anyway, it may be due to the fact that Buzz is built on the G-mail platform. Your own Buzzs even appear in the All Mail folder.
Can't find an option to turn that off yet. But if you are thinking how to get rid of those auto E-mails, try to create a filter. Buzz updates sent from address: noreply-XXXXXXXX@updates.google.com, where XXXXXXXX is profile ID of the sender. Anyway, it seems to be safe to create a filter like this: