There are a lot of support groups. Here are some to get you started connecting with other Chiarian's. You will have to join these groups and organizations to be a part of the message boards.
On Yahoo!:
http://health.groups.yahoo.com/group/CCIparents/ Chiari Connection International Parents (CCIParents)
health.groups.yahoo.com/group/Chiariansunite
http://health.groups.yahoo.com/group/chiari/ The World Arnold Chiari Malformation Association (WACMA)
http://health.groups.yahoo.com/group/ChiariConnectionInternational/ Chiari Connection International (CCI)
http://health.groups.yahoo.com/group/wacmaparents/ World Arnold Chiari Malformation Association Parents (WACMAparents)
http://health.groups.yahoo.com/group/wacmakids/ WCMA kids (for kids and young adults who have Chiari)
On MSN:
http://groups.msn.com/arnoldchiarimalformation Arnold Chiari Malformation
http://groups.msn.com/AngelsOfArnoldChiariMalformation/welcome.msnw Angels of Arnold Chiari Malformation
Organizations
http://asap.org/forum/index.php ASAP message boards
http://conquerchiari.org/onlinemeetingplace/login.asp Conquer Chiari Meeting place
www.chiariansunite.org Chiari People of Ohio
Myspace Groups:
http://groups.myspace.com/index.cfm?fuseaction=groups.groupProfile&groupid=106966530&Mytoken=31A35ECC-564B-40C7-841F06259A6CB9DD52713440 Chiari Malformation Study Expressway
http://groups.myspace.com/index.cfm?fuseaction=groups.groupProfile&groupid=106716823&Mytoken=31A35ECC-564B-40C7-841F06259A6CB9DD52713440 The Chiari Malformation Group
http://groups.myspace.com/index.cfm?fuseaction=groups.groupProfile&groupid=101630632&Mytoken=31A35ECC-564B-40C7-841F06259A6CB9DD52713440 Syringomyelia & Arnold Chiari Malformation
http://groups.myspace.com/index.cfm?fuseaction=groups.groupProfile&groupid=100634780&Mytoken=31A35ECC-564B-40C7-841F06259A6CB9DD52713440 Arnold Chiari Malformation
UK Groups
www.chiariforums.co.uk UK Chiari Forum