Share your Google + Circle-if you have joined Google +, you can use Picasa 3.9 to share directly with the circles you created in Google +. They will see your photos and videos in their own Google + stream. People who do not use Google + will not be missed. They will receive an email in the · See your albums in Google+, and you don't need to be a special addition to Google +.
Picasa name tag in Google +-if you have joined Google +, you may notice that the name tag is more socially useful than before. After Picasa 3.9 is released, you can now upload and share name tags in Google +. Please note that if you choose not to join Google +, the name tag will not change.
New photo Modification effect-We've added a lot of new modifications, such as Halo, Two-color, border, and so on.
Modify side-by-side to compare two different photos. Alternatively, when you apply the modification in Picasa, compare the original and modified versions of the same photo. Learn how to modify side-by-side.