www.marfan.ie is the website of the Irish Marfan Syndrome Support group.
www.medicinenet.com/Marfan_Syndrome/article.htm contains a Marfan article.
www.marfan.org.uk is the UK Marfan website.
www.marfan.ca is the Canadian Marfan website.
www.hopkinsmedicine.org/CardiacSurgery/marfancenter/index.html is the Johns Hopkins Hospital website.