Another great release announced today is Rawstudio 0.5. There are several improvements, the most important to me being the incorporation of batch processing. I've been using a development version for a while now and I have to say as a Linux user who shoots almost all my stuff in RAW format, it's a great project. I find the workflow very efficient. It's nice to see so much work being done on this front.
Like all good open source projects, the developers are eager to improve the project and are willing to discuss all sorts of suggestions and ideas on the mailing list. If you're currently using ufraw or another application for your raw photo conversions you should really check this out, you might find it's just what you've been looking for.