To see how important is Google Buzz for Google, consider that Buzz wasn't launched in Google Labs. It wasn't even launched as a standalone service: Google Buzz was integrated with Gmail, one of the most popular Google products. Google Buzz is also the only Google service that has a special icon and a special search command on Google's mobile site. In less than 7 months since Buzz's launch, the service already has a powerful API, it's integrated with Google Maps, Google Reader, Picasa Web Albums and it's constantly improving.
Google Buzz is actually the service planned in 2007 whose goal was to integrate Google's social applications and become the central place for sharing photos, documents, videos, news with your contacts. Google Buzz already streams some activities from Google Reader, Picasa Web Albums, Blogger, YouTube.
Google Photos blog reports that Google Buzz can now share private Picasa Web Albums:
"It used to be all or nothing when it came to sharing a new Picasa Web Album in Buzz. If you created a public album in Picasa Web Albums, it created a public Google Buzz post. That was great for when you wanted to share your photos broadly. But for those times when you wanted to share with a smaller circle — no Buzz. Now when you create a private album, the select people you choose to share your photo album with will see a notification in Google Buzz as well."
Google Buzz also added two other important features: muting posts by source, so you can hide someone's Twitter posts, Flickr photos or the posts from another source, and editing posts and comments from the mobile interface.
It should be clear that Google Buzz is here to stay, even as a feature of a future service.