Commonmind

Ahh, a topic after my own heart.

Let's see: A Game of Thrones and A Clash of Kings (and the other A Song of Ice and Fire books as well), most of the books in the Dragonlance series, most of the books in the Forgotten Realms setting, Wizard's First Rule, The Dragonbone Chair (and To Green Angel Tower), The Sword of Shannara, The Hobbit, and The Lord of the Rings, The Deathgate series, Spiderwick, The Edge Chronicles, Harry Potter (the entire series as well), Artemis Fowl, Inkheart, Moby Dick, anything Charles de Lint puts out, Ender's Game, Ender's Shadow, Xenocide, Shadow of the Hegemon, The Eye of the World, The Great Hunt, The Hitchhikers Guide to the Galaxy, Ranma, The Egyptian, The Elric Saga, Tales of the White Wolf, The Princess Bride, Peter Pan, Alice's Adventures in Wonderland, The Sword in the Stone, Seraphim, Timeline, Jurassic Park, Trace, One for the Money, The Bible (more specifically the Peshitta), Alice in Quantumland, Beyond Einstein, Hyperspace, A Brief History of Time, Richard Feynman's The Character of Physical Law and last, but certainly not least (not considering I probably left out a few dozen of my personal favorites), Atlantis: the Antediluvian world.

I classify favorites as books I both thoroughly enjoyed and that I've often picked up for second, third, even fourth readings, and the above are definitely some of mine.