Sorta sketchy, but works in 9.0a Rated 5 out of 5 stars
Works in 9.0a just fine. A window pops up with a preview of your image, text boxes for tags/captions, a drop-down for album selection (must be pre-existing album), and some light image editing features powered by FotoFlexer. Alot easier than downloading the image and then manually uploading to Picasa. Also a chrome version of the addon.