Time Traveler's Wife - Audrey Niffenegger
The Baroque Cycle (comprises Quicksilver, The Confusion, and System of the World); also Cryptonomicon - Neal Stephenson. If you're a fast reader, Neal Stephenson books will STILL take you a few days. Seriously.
Deepness in the Sky and Fire Upon the Deep - Vernor Vinge


Pillars of the Earth...what's the story line with that? I really feel like I've read it...