The Google Buzz app for Android is a widget for phones running Android v1.6 and later. The Buzz app will allow you to post text and photos with a single tap. In addition to that, you can also tag your post with your current location or place you posted it from.
Once you have posted the message, the Buzz app will process it in the background, so that you can continue performing other tasks without having to wait.
The Google Buzz app is available in the Android Market, just head over there and search for Google Buzz. To add the widget to your home screen, go to "Menu" and select "Add > Widgets > Google Buzz". Currently, the Google Buzz app is only available in English, with support for future languages coming soon.