Google released Picasa 2.7 beta for linux. http://picasa.google.com/linux/download.html

Here is a list of features and known issue from the site:

This is a preview of the upcoming release of Picasa for Linux. We encourage you to try out this beta release and provide feedback to help us improve our product.

New Features:

• Upload to Picasa Web Albums
  Use the new “Web Album” button to post your best photos online to share with friends and family.
• Save edits to disk
  Save edits, undo saves, and revert to the original file with ease. We’ve got batch saving too! Picasa will even match the jpeg quality of the original. Right-click on your saved files to try the new “locate original” feature.
• Folder hierarchy views
  Browse through folders Explorer-style. Use the button at the top of your Albums List to try them out.
• Improvements to Import
  Import into an existing folder- we know you’ve wanted this feature for a long time! We’ve made importing photos from your camera faster too.
• Better RAW support
  Now you can work with RAW files from the Canon 30D, the Nikon D200, Adobe DNG files, and more.
• Many other enhancements
  Larger thumbnails, better caption editing, ability to configure the row of buttons, special “Starred
  Photos” album, search by ISO and focal length.

Known Issues:

• The system tray does not close with loss of focus (if you bring up the media detector menu, you have to either start picasa or stop the media detector to get the menu to go away)
• Picasa notices don’t stay on a given desktop. Picasa pops up notices to let you know it’s found new photos or has added photos to its library. These notices come on the current desktop; some users would rather they stayed on the same desktop that Picasa itself was on.
• Several BlogThis! features do not work properly with Picasa’s embedded browser window, such as spell check, the palette selector, and new account URL tester.
• Music playback during slideshow doesn’t work.
• If you have an NFS mounted home directory, the performance may be poor. Picasa relies heavily on a lot of files in the ~/.picasa directory, and if the home directory is slow, then Picasa will be slow. You can work around this by making a directory in /var/opt/picasa/$USERNAME/ that corresponds to your username. You have to have full rights to that directory.
• A few print providers (namely Photobox) do not work correctly.
• On multi-monitor displays, some interface elements do not display correctly. We currently do not have full Xinerama support.
• Album uploaded as ‘Public’ album without selecting any of ‘Public/Unlisted’ radio buttons in Picasa Web Album dialog.
• Slideshow and Timeline do not show full-screen images when running on a 24-bit depth X server, even if that setting is checked in the Options dialog.

[via http://picasa.google.com/linux/download.html ]