vanilla-pudding at Yahoo! Groups - The mailing list for Vanilla, a simple and extensible hypertext system which subscribes to the Wiki philosophy and is written in REBOL - http://tech.groups.yahoo.com/group/vanilla-pudding/
rtog-list at Yahoo! Groups - A members-only list for readers of "REBOL: The Official Guide", maintained by the author - http://tech.groups.yahoo.com/group/rtog-list/
OSCAR-PROJECT at Yahoo! Groups - A site for discussing development of an open source REBOL intepreter - http://tech.groups.yahoo.com/group/OSCAR-PROJECT/
New Programmers at Yahoo! Groups - A discussion for non-programmers who would like to learn the easy and powerful language REBOL - http://tech.groups.yahoo.com/group/Rebol_New/
REBOL at Google Groups - A small but active discussion group that started in December 2004. - http://groups.google.com/group/Rebol
Archive of REBOL mailing list - searchable archive of the Rebol Mailing List since July 2000 - http://www.rebol.org/cgi-bin/cgiwrap/rebol/ml-index.r
Rebol Talk - online forum "for Reb's new and old to share their knowledge" - http://www.reboltalk.com/