Depression Alliance - Information and support for people with depression.
Seasonal Affective Disorder Association - Support organisation. Information and membership details.
Aware Defeat Depression - Includes information about support groups and the symptoms of depression, plus publications and a discussion forum. Based in Northern Ireland.
Bristol Hypnotherapy Clinic - Brief therapy for clinical as well as ante and post natal depression. Includes information about the causes of depression.
The Depression Trap - Book written to help those suffering from depression. The site also contains a blog on depression by the author Nancy Hine.