There are many ways you can help USBSink. As you use it and test it, feel free to report bugs, request new features, and make suggestions regarding documentation. If a package is not available for your distro, request it. If it is not available in your language, you are welcome to translate it.
If you're a developer, working on new features is probably the most attractive option for you. A good part of the source code is covered by Doxygen documentation, and I would be happy to help you get into the codebase quickly. Below I have listed some short and long term things which I think should be worked on in future.
As of April 2007, Subversion is used for version control. To access the SVN repository, execute the following command:
svn co https://usbsink.svn.sourceforge.net/svnroot/usbsink/trunk .
You can of course
browse it online.