Frank Herbert’s Dune. I never get tired of that book.
Anne of Green Gables, all eight actually.
Jane Austen’s four most popular books are also commonly read around here. (of course.)
I’m not much of a rereader. There are so many great books I haven’t read yet that when I do get around to reading one, I feel like I can’t waste time rereading. I may make an exception soon for 1984, though.
It may be a kid’s book, but I still find relevance in Maniac Magee, by Jerry Spinelli. I read it three or four times as a kid, and a couple of times in my adult life. Still a great read.
I reread this set from time to time. I always look forward to the end, because Rilla is my favorite one.
Same here; I also read The Great Gatsby and the Stand once a year.
Same here, but just once a year.
And The Stand.
And The Secret History.
And Memoirs of a Sword Swallower, by Dan Mannix, which has been a favourite since I was about 7.
I must admit that Emma has sat on my lap more than once.
I’ve re-read parts of The Thurber Carnival, a collection of stories and essays by James Thurber, since I was about 8 or 9 years old. That makes it about 45 years now that it’s been on my nightstand.
I also read The Stand every couple of years.
I read Patrick O’Brian’s Aubrey/Maturin series every 2 years or so. I just finished Desolation Island in fact.
Grendel by John Gardner
also Foucault’s Pendulum by Umberto Eco every couple years
I’ve re-read Gone With The Wind more than any other book, possibly over a hundred times since age ten. As fessie said, it’s pretty interesting how my views about the characters and events have changed over time. I haven’t read it now in years because I can refer to most of it by memory.
I’ve decided to use some of my audiobook time for re-reading things now, because I have such a flood of new stuff coming in all the time I don’t get to re-visit my old favorites as much as I’d like to.
Oddly enough, I’m more likely to reread genre fiction than I am to reread “great” literature.
LotR many many times over the decades.
All of the Anne of Green Gables books, especially when I’m down with the flu. Some of Montgomery’s other books, too, like The Story Girl and Blue Castle.
Elizabeth Peters’ Amelia Peabody series. Light reading, but hysterical spoofs of romantic adventure stories. I find more in them every time, and have developed a bit of interest in archeology through them.
Robert A. Heinlein’s The Moon is a Harsh Mistress, Stranger in a Strange Land, Time Enough for Love, and The Number of the Beast
Diana Wynne Jones’ Fire and Hemlock, Archer’s Goon, Howl’s Moving Castle
The Sherlock Holmes stories maybe a dozen times or so, same with Pride and Prejudice and Jane Eyre.
I’ve greatly enjoyed many of the books mentioned above, but haven’t felt the urge to reread Salinger. But I think I will reread Eco’s In the Name of the Rose this winter, before reading The Mysterious Flame of Queen Loana.
Oh, so many others, but this is enough for this post.
Hinckley, is that you? 
I also read Alice and Looking Glass (I just started reading them to my 7 year old daughter) along with The Hobbit.
The novel I’ve read most often is I Married A Communist by Phillip Roth, part of the Nathan Zuckerman cycle. It has its flaws but the issues it deals with and way in which it deals with them makes it endlessly appealing to me.
For non-fiction Norman Davies’ * Europe: A History* gets an airing every few months and any of Bill Bryson’s makes good toilet reading or late-night zombie reading.
I never reread a book, but I just started Watership Down for the second time.
I re-read Watership Down from time to time. And I’ve re-read James Herriot’s books multiple times. It’s comfort reading.
If I had children, I would certainly get them a copy of Gnomes. http://www.amazon.com/dp/0810909650/
Anything by Louis L’Amour. Quick reads that give you vivid descriptions, and make you forget about life for a little while.
ETA: Bowdrie and Flint are probably the ones I have read the most.
Every time I re-read “Her Savaged Rump” I find subtle nuances of plot and characterization that I missed on previous readings.