Google innovates, but sometimes it takes them a little time to roll them out. Case in point is Picasa, which is finally delivering Google+ sharing and tagging, though even though searchzilla’s social network has already iterated repeatedly since its June 28 launch.

Picasa 3.9 (release notes) is a major update of Google’s iPhoto competitor with Google + sharing and tagging, as well as a slew of “new” image effects and editing/creation tools:

• Added ability to upload to Google+ and share with circles, post pictures to your stream, and upload images at original size.
• Social Tagging: name tag people in your Google+ circles and notify them via G+.
• New photo editing effects, including: Infrared, Lomo-ish, Holga-ish, HDR-ish, Cinemascope, Orton-ish, Sixties, Invert Colors, Heat Map, Nightvision, Cross Process, Posterize, Duo-Tone, Boost, Soften, Vignette/Matte, Pixelate/Focal Pixelate, Focal Zoom, Pencil Sketch, Neon, Comic Book, Border, Rounded Edges, Drop Shadow, Museum Matte, Polaroid
• Side by side editing: compare two pictures side-by-side
• Updated RAW support for pictures from newer cameras (not listed)
• Support for WebP files
• On the Tools > Experimental menu, we’ve added support for migrating your database to another local drive.
• Improvements to Face Movie maker: number of photos included, chronological ordering.
• Sync now uploads unshared albums privately.
• Improved restoring of virtual albums when you uninstall and reinstall, or move to a new computer. Album data is written to the picasa.ini file now, along with all of your other edits.
• OAuth support: use 2-factor accounts without getting an application-specific password.

Get your copy of Picasa 3.9 here