Here are some tips for Google Buzz which is posted on Gmail Blog
1. You can format your text using *bold*, _italics_, or -strikethrough- (*Name* or _Name_ or –Name-)
2. You can view Buzz summery on google Dashboard
3. You can use @ to post directly to one person (Like twitter)
4. You can use key board shortcuts
5. You can Mute a post so that they will not reach your inbox.
Read more from the official blog here