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