Are their any good websites (characterized by high usage), that use JSF for their back-end? I have just started working with the basics of the framework. If I see some websites using JSF, may be I will be able to better appreciate the use of the technology.
Also could you mention the benefits of using JSF validation viz a viz the browser side validation of content using JavaScript.
See here for a list of JSF sites.
In addition see the references for two famous JSF component frameworks:
As for the validation – it better be on both sides – on the client side (javascript) for better usability, and on the server side for better security.