OK Norm I'll bite especially considering you've cajoled Doubting Thomas to take a stab at it. FWIW here's myTop 10 list of favourite books, in no particular order as that is just asking too much. I also reserve the right to list multi-volume sets as one item and non-fiction :-) I'm operating at a bit of a handicap here as my library is all packed away and I can't glance over at it to jog my memory.

1. The Lord of the Rings trilogy - J.R.R. Tolkien (1954)
   Quite possibly the finest "book" of the 20th C. A sweeping epic that examines humanity's fight for good to triumph over evil in through the fine tradition of the quest.LoR has a special place in my heart. I learned to read at age 4 and I was a voracious reader until I was 14. For whatever reason I mostly stopped reading in my teens but in 1972 while auditing classes at a local college I discoverd LoR and reignited that flame, which still burns bright.
2. The Left Hand of Darkness (1969) - Ursula K. LeGuin
   A breakthrough in Science Fiction, LeGuin's book looks at human relationships and sexuality through the lens of an androgynous society in the future.
3. The Naked and the Dead - Norman Mailer (1948)
   In all likelihood the finest novel to come out of WWll (I would put Heller's Catch 22 a very close second). Reading this book you are left with no illusions as to the horrors of war.
4. Sophie's World - Jostein Gaarder (1991)
   This is one of the most interesting books I've ever read. On the surface it is the story of Sophie, a young Norwegian girl, who is being educatedin the art of self-discovery through the mail from an unknown tutor. The book examines philosohical themes that appear over and over again throughout human history and looks at how different thinkers have attacked those themes and how they relate to ourselves. You do not have to be a philosophy major to understand this book and the concepts it puts forward and that is one of its greatest strengths
5. The Deptford Trilogy - Robertson Davies (1970 -1975)
   Robertson Davies is, in my opinion, Canada's greatest author and this is perhaps his finest work. filled with references to literature, opera, mysticism, history and written with a very wry wit. These books are sheer pleasure to read and you will keep coming back for more.
6. Ender's Game - Orson Scott Card (1985)
   I think Card is the finest of current crop of science fiction writers. His Hegemon series of which Ender's Game is the first book is an intense look at xenophobia, politics and dangers of mind control.
7. New Rules for the New Economy Kevin Kelly (1998)
   My field is telecommunications and this is perhaps one of the most important books that has been written on the technological revolution we find ourselves in the midst of. I often quote Kelly in presentations and reports that I write. He has a grasp of the fundamental changes we are undergoing and of where we should be focussing our attention that few other tech pundits have. If you read his book and don't get excited about our new world, check your pulse.
8. Stranger in a Strange Land - Robert A. Heinlen (1962)
   Another look at xenophobia, prophets, politics and what it means to be human. This book was in many ways the bible of the 60's. It's themes rsange from anarchy to feminism and it set the cultural stage for what was to happen in the 60's.
9. The Sot-Weed Factor - John Barth (1960)
   A rollicking funny tale set in the late 17th Century. Based on a really bad poem The Sot-Weed Factor (tobacco salesman) by Ebenezer Cooke - this story follows the life of the protagonist through a series of adventures in England and Maryland.
10. Myth and Ritual in Christianity - Alan Watts (1950)
    Perhaps a quote from Alan Watts will help:
    Faith is a state of openness or trust. To have faith is like when you trust yourself to the water. You don't grab hold of the water when you swim, because if you do you will become stiff and tight in the water, and sink. You have to relax, and the attitude of faith is the very opposite of clinging, and holding on. In other words, a person who is fanatic in matters of religion, and clings to certain ideas about the nature of God and the universe becomes a person who has no faith at all. Instead they are holding tight. But the attitude of faith is to let go, and become open to truth, whatever it might turn out to be.