If you want to search Google Buzz for public messages you need to log into Gmail and use the search form at the top. There does not seem to be another official option to search public messages in Google’s new social messaging service. The public messages might eventually make it into the Google search engine but that is currently not the case.
Users without Gmail or Google Buzz are therefor not able to search for Buzz messages. That’s where the third party search engine Buzzzy might come in handy.
Buzzzy basically allows everyone to search not only Google Buzz messages but also public Twitter, Friendfeed or Google Reader messages.

Search results are sorted by relevancy and not time with no apparent option to change the sorting in the search engine.
It is however possible to make use of the filters on the right to filter by timeline, source or media type.
The blog post introducing Buzzzy states that it is an early alpha release which means that it is likely that the developers will start adding new features and requests of the community.
Searching Google Buzz for public messages works pretty stable on the other hand and considering the absence of third party alternatives at this point a solid option for users who want to search Google Buzz.
Update: Google in 2011 has made the decision to retire Google Buzz. The service as it stands now is no longer available, or accepting new members. Google is asking users to switch over to the company’s new social networking service Google+ instead.
Related Articles:
Google Buzz IntroductionGoogle Retires Google Buzz
Google Buzz Extensions For Web Browsers
Add Google Sandbox Search Engine To Web Browsers
Google Adds Translated Search To Its Search Engine
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Looks like Buzz is buzzing around the net, sounds like a bar to me.! Ahh yeah that sounds cool, Goggle’s Buzz Tavern! Anyway I think the idea is cool and opens a whole world of social communication! I always thought hmm, who will end up making the coolest site! I dig facebook, but it a little stiff and getting around can be tricky.. Myspace strangers seems to say hey to me more.. which is cool a very powerful tool in marketing. I have dug Twitter since day one, they rock… and FRiendfeed is just plain cool! I can’t wait to check out what Buzz has to offer and how it till change social networking and social media.
Looks pretty stable indeed and useful too.
Out of curiosity my first search was Bloglines
because it has not been updating for over a day.
The first listing was:
… just switched from being a long-time Bloglines user to using Google Reader..
Since I have just done the same thing I’ll give this a thumbs-up.