Picasa for Mac has been designed to play nicely with iPhoto.

Picasa doesn't store any of your photos. It simply scans your hard drive and displays the photo files it finds. In this way, Picasa folders represent the actual directories containing photos on your computer's hard drive.

Picasa handles the iPhoto Library in the same way, with a small variation made for the way in which the iPhoto Library organizes your photos: If you've made edits in iPhoto, each album or event in your iPhoto Library contains an 'Originals' folder and a 'Modified' folder.

Picasa scans the photos and videos in both the 'Originals' and 'Modified' folders, and displays a single collective folder with the most recent version of each file.

Control large photo collections
Picasa can find and display a huge number of images (now up to a million photos!) from all over your computer. And Picasa automatically keeps track of new photos on your hard drive.

Edit without worry
Picasa's easy-to-use editing tools apply 'virtual edits' to your photos, until you're sure you want to save your changes to disk. Even after you save, a backup of your original image is just a click away.

Keep your online photos up-to-date
Crop a little from a photo here, add some shadow there, and then just watch your photo edits automatically sync to your online Picasa Web Albums.

Share with a click
Picasa works seamlessly with Picasa Web Albums to help you quickly share online photo galleries with friends, family, and the world. With 1GB of free storage, album privacy settings to suit all needs, and the ability to upload and download at any size (including print-friendly originals), Picasa Web Albums makes it easy for others to enjoy your best photos, too.

Here are some key features of "Picasa":

Sync your Picasa 3 and Picasa Web Albums edits:
· Tired of having to manually re-upload your photos after making further edits? By enabling 'Sync to Web,' edits made to your photos in Picasa 3 are automatically transferred to your corresponding online albums.

Retouch your images:
· Always want to be airbrushed? Use the Retouch tool to remove unsightly blemishes and improve photo quality. It can also help you to restore old photos with marks, water stains, and scratches to excellent condition.

Preview image files with Picasa Photo Viewer:
· The photo viewer is a fast, lightweight application for viewing images on your desktop or through Windows Explorer. Installed with Picasa 3, it lets you to take a quick look at images without having to fully open the Picasa 3 program.

Create and edit movies:
· Combine your photos, videos, and music into a movie or use the editing room to trim your existing movies.

Capture your screen:
· Instantly take and import your screen captures and webcam captures into Picasa 3.

Add text or watermarks to your photos:
· You can easily personalize your photos using the Watermark and Text tools.

Print captions:
· Your captions are about to see a little more action. You can now print your captions or photo file names on or below your photos.

Upload easily to Picasa Web Albums:
· Use the Drop Box to hold quick uploads and upload throttling to multi-task during your upload.

Control your Picasa Web Albums settings:
· If you have an online album in Picasa Web Albums, you can now control the online settings through the corresponding folder or album in Picasa 3.

Manage folders on your computer:
· It's now possible to move entire folders around on your hard drive from within Picasa 3.

Requirements:

· 256MB RAM
· 100MB available hard disk space

What's New in This Release: [ read full changelog ]

· Fixed an issue where editing contact information in Picasa altered the formating of contact information at http://contacts.google.com/
· Added a progress bar when batch editing with 'Auto Red Eye Correction.'
· Fixed an issue where the 'Tools' < 'Clear Geotag' menu item was disabled for geotagged photos.
· Fixed a memory leak on Mac that occured while uploading.
· Increased stability through multiple crash fixes. Thanks for reporting!