From the Google Mobile Blog
What many Android and Buzz users were waiting for: Google released a Google Buzz widget for Android phones that lets you post text and photos with a single tap. Like other mobile access points for Google Buzz, the widget lets you choose to tag your post with the location or place from which it was posted.
The widget is initially available in English for Android phones running v1.6 and later. Search for 'Google Buzz' in the Android Market to download it.