Javaserver faces 2 is not popular enough now, but it's growing now. Small(but not helloworl level) and functional(such as CRUD with ajax, project level template especially the page composition layout) sample application is usefull for start teams. Showcase can be seen as component user guide and handbook, on the other hand, functional sample can be seen as project guide.
I hope Primefaces community will plan to do such things. I will do somethings I can do for community too(though my english is so poor, but at least I can do some test work).
If you have had such samples and like to share it. show and share it.