Jonathan Sposato, (Product Management - Photos Team) Say's
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.
Just make sure you have Picasa Web Album as one of your connected sites in Buzz to take advantage of this easy way to share your albums.