Buzz and Android 1.5...

A quick note to people with a HTC Hero who are still waiting to get a newer version of Android and therefore are stuck with the old Maps for Android version 3.1.2:

Buzz already is integrated into your version! No need to wait for 4.0 - if you can live without some bells and whistles, all you need to do is switch to the Latitude friend list, select the Updates tab, and you're using Buzz.