"Left Heart Matters," the website for a British charity dedicated to HLHS.  A great online resources that includes online brochures with diagrams of HLHS hearts, links to support groups and other organizations, and webpages and contact info for other HLHS kids.

hlhsinfo.org, with information and resources for parents of HLHS kids.

hlhs.org, with links to an HLHS symposium examining many issues surrounding HLHS treatment (registration required).

hlhs.net, a part of kidshealth.org.

pediheart.org article on HLHS 

littlehearts.net and childrensheart.org and  dedicated to children with congenital heart defects.

heartcenteronline.com, with descriptions and images of various heart conditions.  Includes a very realistic depiction of a hypoplastic left heart and an HLHS article by Dr. Levchuck

The Childrens Health Information Network - Congenital Heart Disease Information and Resources.

Affairs of the Heart, a PBS show featuring the Fontan Operation and Zach's story.