We reviewed the RAW photo editor LightZone almost a year ago, when the Linux version of the product was a closed source -- but free -- download. After months of updates only for the Mac OS X and Windows versions of the application, Light Crafts has released a new beta for Linux. It is a substantial improvement -- but it also marks the end of the road for the free edition.
If you're finding DigiKam or F-Spot, two of the many photo organization and editing tools for Linux, a bit limiting you may want to give Lightzone a try. The software isn't free, and curiously, isn't available for purchase either, but judging by the 20-day demo version currently available, it could end up a serious contender in the hybrid photo editing/managing market.