Yes! A really good one can be found at http://www.freeyellow.com/members5/shelbowen/index.html.
The United Mitochondrial Disease Foundation has support groups and additional information at http://www.umdf.org.
I also recommend PD Heart: Congenital Heart Defect Support Group at http://www.strata.ca/pdheart/. This site has a daily message board and is free to the public.
There is a detailed site at Harvard that deals with hypertrophic cardiomyopathy. This site has some great pictures! http://genetics.med.harvard.edu/~seidman/researchandinterests.html
The Hypertrophic Cardiomyopathy Association: http://www.hcma-heart.com/
Last Updated 02/02/00 by the Metz Lab.