I love this thread!
I'm going with books that had the greatest influence on me in my youth. These might not be the greatest books ever written (although I think a couple of them are), but they are novels that spoke to my soul and inspired me to read more, more, MORE.
CHARLOTTE'S WEB
THE CATCHER IN THE RYE
STRANGER IN A STRANGE LAND
GREAT EXPECTATIONS
A CHRISTMAS CAROL
DANDELION WINE
And, for me, the winner is . . . CHARLOTTE'S WEB.
I'd like to add how much I enjoyed seeing THE STAND mentioned in this thread. I have yet to read it, and I would not have expected to see it listed here. Though recommendations from friends, THE STAND begged me to read it for years, but I ignored it. I finally downloaded it last month. I look forward to reading it this summer. (Something tells me I will feel I put it off reading THE STAND for far too long.)
With thanks to everyone here, I've also been inspired to read novels I've neglected . . . and to reread books I have not read in a long time--THE GRAPES OF WRATH, for example. It's been ages.
Thank you, everyone.