The REBOL mailing list is *the* best resource out there. Great, generous, people hang out there. you can subscribe at http://www.rebol.com/support.html or http://www.rebol.org/cgi-bin/cgiwrap/rebol/list-links.r)
Both rebol.com and rebol.org list various other resources as well. rebol.com has a new "cookbook" page and rebol.org has almost 500 user contributed scripts you can learn from.