I am not very interested in any service that can't be taken with me on my mobile phone so after seeing Sam's coverage of Google Buzz I immediately started searching for how I could use it on my smartphones. There are actually a couple of ways to interact with Buzz on your smartphones and the easiest way (for iPhone and Android owners currently) is to simply point your mobile browser to buzz.google.com. You can read about the mobile web app features on the Google Buzz for mobile site and see a table at the bottom that shows iPhone and Android have the best support with limited support (Buzz layer on Google Maps for mobile) on Nokia S60 and Windows Mobile. Unfortunately, there is no support for Buzz on RIM BlackBerry devices at this time.
A few advanced features supported on Android 2.0+ and iPhone are Buzz on a place page, voice shortcuts, and Buzz icon shortcuts. You can actually speak "post buzz" in voice search from the Google Mobile app on the iPhone or the quick search voice widget on Android. The Buzz layer on Google Maps comes in the form of updates to Google Maps for mobile on Android, iPhone, S60, and Windows Mobile.
I have a Google Nexus One and tapping the Google Buzz icon on Google Maps opens up a screen where I can quickly enter a Buzz or even tap an icon to upload a photo from my gallery or from the camera directly. You can also scroll around the map and tap on various conversation bubble icons to see what others have posted on Buzz. Google Buzz brings a location-based social networking experience to your smartphone that may turn into quite a useful service, similar to a Foursquare check-in experience.