Google's Picasa application is a great photo editing one for those who aren't after anything too advanced, as well as for people who don't fancy paying for software. That's not to say it's a bad application, however; it's quite the opposite, and the newly released version 3.5 shows this better than ever before. Macworld has an explanation of some new features, to add to Google's official release notes.
The biggest feature with this version is the enhanced people-tagging ability, which was only available in Picasa Web Albums before this release. If you're familiar with Faces in Apple's iPhoto software, this will immediately make sense to you; Picasa scans all your photos, adds face tags to each one and groups them together, ready for you to name people. Another handy feature is the extended compatibility with Google Maps and geotagging, as you simply drag your photos onto the map to indicate where they were taken. Google points out that you can still use Google Earth to tag and view photos, also.
Google has improved the importing process in Picasa, increasing support for Picasa Web Albums, as well as photo tagging. Bulk tagging has been improved, as well as quick tags. If you want to download Picasa 3.5, head over to the official web page and follow the instructions as you would normally. If you need any more information, you can have a look at the blog post for the update, or else you can watch the video included below.