I started my first project on Sourceforge.net, project title UUIDgen (link). The very simple Java Swing application creates UUID’s on demand. Not really a big deal, since the basic packages are ready available in Java SE. Gather some experience with the process of creating releases, documentation and maintaining sourcecode in the open source context. Feel free to download the first release (requires installed JRE) or get the Netbeans 6.1 project.