Google bobile blog published two posts on Google Buzz on your phone tips
the tips are
1. Post buzz with your voice.
2. Filter the Nearby tab for a specific place.
3. Search!
4. Post from your city-level location.
5. Refresh your location.
Read more here
6. Search for a place to post from
7. Learn more about a tagged place
8. Choose to share privately or publicly
9. View mobile profiles and follow new people
10. Auto-finish @reply
Read more Here