Cyril mentioned a number of online references during his talk. These are listed below, each with a brief note of that they contain.

http://www.cyndislist.com/dna.html
Genetics, DNA & Family Health

http://www.genealogy.com/202/lesson2/course2_01.html?Welcome=1024424603
Internet Genealogy, Level 2 Lesson 2

http://www.genealogytoday.com/articles/genogram.html
From Genealogy Today: Genograms

http://www.med.und.nodak.edu/depts/fammed/Clerk/
GENOGRAM.htm Example genogram

http://www.geneweaveronline.com/index.htm
A commercial tool for creating and maintaining your family health history.

http://www.genopro.com/
GenoPro's Features (produces Genograms)

http://www.hgmp.mrc.ac.uk/omim/searchomim.html
Online Mendelian Inheritance in Man – the geneticists vade mecum – everything (almost) there is to know about genetic disorders and genes

http://gateway.nlm.nih.gov/gw/Cmd?GMBasicSearch
This is the main entry point to MEDLINE (PUBMED), the National Library of Medicine index of the major part of the medical literature

http://www.gig.org.uk/
The Genetic Interest Group – the UK cover organisation for family support groups

http://www.rarediseases.org/
NORD – the North American equivalent of GIG

http://wwwihm.nlm.nih.gov/
Images in medicine – a library of medical images