Gallery 2.2 (Double Double) is now available for download! In what has been close to a year of development, the Gallery team has packed this release full of new features and security enhancements. Major new features include: Downloadable Plugins which let you download, install, and upgrade modules and themes through the web interface; Dynamic Albums which let you set up albums based on keywords, ratings, and more; and WebDAV support for managing your photo library like a network hard drive with folders of images.
Theres a lot more in the official announcement!
If you're using Gallery you should upgrade today, and if you aren't using Gallery you should be! Check out mine here.