The following are some of the best posts about RichFaces. Of course everything is good, but these important core features and other good examples:

Easiest way to start with RichFaces (Eclipse template)
RichFaces with Hibernate Validator
RichFaces built-in client functions
RichFaces region – partial JSF view processing
View scope in RichFaces
Using rich:layout and rich:layoutPanel components
4 – part RichFaces webinar series
Changing RichFaces skins in runtime
Using rich:layout and rich:layoutPanel components
RichFaces confirmation dialog – complete edition
RichFaces sorting and filtering – complete edition

For everything else, just click on richfaces-howto tag and you will get to all RichFaces posts.