Want the same kind of facial recognition, name tagging and easy geo-location of Picasa 3.5 for Windows and Mac on your Linux desktop? There's no official release, but you can fairly easily plug Picasa into your system.
The OMG! Ubuntu! blog tried it out first, and found that by having Picasa 3.0 installed, then installing Picasa with a standard WINE configuration (here's how to set one up) and moving its files into Google's own Picasa-optimised WINE folder on your system, you can basically upgrade to 3.5 with just a little more fuss than would normally be required.
Why no official upgrade? Information Week gets a statement from Google noting low installation numbers for Picasa in Linux. That said, Picasa is definitely one of the most developed photo managers available for any system, so let's hope Google changes its tune for future releases.
Install Picasa 3.5 in Linux [OMG! Ubuntu!]