JavaBLACKBelt - Java Certification Community

Last week I registered myself on the JavaBLACKBelt Certification Community. On this website you can test your Java related knowledge with questions managed by an open community (for free!). After succeeding for an exam you can show it to the world on a personal page like mine.
The idea is to take exams, get a higher rank (with colored belts like in karate), and also contribute to the community by reviewing questions, or even post your own and have them reviewed. When the community accepts your questions, it will be added the real exam.
I took some sample exams, and am really impressed by the quality of the actual questions, and the overall system.
I really hope this system will get a lot of attention and success, as this will open the certification market into the open source!