Google Buzz has a lot going for it. Really. No need to laugh me out of the room.
For starters, it was initially force-fed to a huge chunk of Gmail's installed base estimated at around 150 million users. It is also better positioned for conversations and site sharing as opposed to Twitter (who's main value nowadays revolves around social buzz search).
So.. if you're still trying to figure out Google Buzz, here's a great article from Social Media Examiner to help you get going:
Visit the tips at:
http://www.socialmediaexaminer.com/google-buzz/