A Day Called Hope by Gareth O'Callaghan. A friend recommended this one to me and I read it in a day. I have "suffered" from depression for over 2 years now and have never read anything so helpful or optimistic. There is a particularly interesting chapter on depression and alcohol.
Since reading it I am a changed person and feel that I am now recovering, rather than suffering from, depression DH, who has been through a really crappy time with me is now reading it and wishes he had heard about it years ago. HTH