The official FAQ for JSF is spread across several FAQ sites
The Official FAQ for the JSF Specification (Implementation Agnostic) http://wikis.sun.com/display/GlassFish/JavaServerFacesSpecFaq
The Official FAQ for Oracle's Mojarra Implementation (used in Tomcat, and all JavaEE 5 containers except Geronimo) http://wikis.sun.com/display/GlassFish/JavaServerFacesRI
The Official FAQ for Apache's MyFaces Implementation (used in Tomcat and Geronimo) http://myfaces.apache.org/faq.html
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