My big favorites (read: fondest memories) are still:

- The Riftwar Cycle, particularly the Riftwar Saga and the Empire Trilogy, and also the Serpentwar Saga. The first book, Magician, I loved so much I read it twice — and I never read books twice.
- The Wheel of Time. Here, I didn't like the first book too much, but most of the others.

Reading through this thread I realize that I'm going to have to check out the Earthsea novels and The Name of the Wind. Thanks for making my list ever larger.