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http://docs.jboss.org/richfaces/latest_4_0_X/Component_Reference/en-US/html/- official documentation.
And it will be more usefull in pair with http://richfaces.org/demo which shows components in action.
Besides it may be good idea to read http://www.jboss.org/richfaces/docs/4-0_guide at leas tbasic sections before starting playing with components itsel. It will be much better if you will understand the concepts in general.