This is my favourite!
Memoirs of a Geisha
I've read it dozens of times and I never get tired of it.
I also love Lord of the Rings, but it's really an acquired taste. I didn't like the books at all when I first tried to read them. In fact it took me something like 4 months to read less than 100 pages before I finally gave up. I picked them up again after I had seen the movies, and then found that I could relate to the characters, the scenery being described and the different races (elves, dwarves, hobbits) of characters. Now the LoTR series of books and movies are among my favourites.
I really enjoy FBI thrillers or books about Vampyres, or medical mysteries. Here are some of the authors that I've been looking for and have read all of their series of books:
Vince Flynn
Dan Brown
Catherine Coulter
Anne Rice
Kathy Reicht
Robin Cook
Lee Child
I tried reading some "James Patterson" but just couldn't get into his writing.
I just finished reading "The Historian" by Elizabeth Kostova
http://www.amazon.com/Historian-Eliz.../dp/0316011770
The book is fabulous. It's about Dracula who was reportedly "Vlad the Impaler" and is a mix of history and fantasy. I liked it so much and became so curious that the book I'm going to read next is the biography of Vlad the Impaler!

I'm currently reading Michael Scott's "The Alchemist" series.
http://www.dillonscott.com/index.htm Well written whimsical / fantasy style novels.
The Year of Living Biblically was an absolute hoot to read
http://www.ajjacobs.com/books/yolb.asp I rank it right up there among my favourites.
Many of the books or authors that I've been reading of late have been because I've seen people mention it here.