Some of these have already been mentioned, but I'll repeat them.
My list:
Terry Pratchett
Guy Gavriel Kay
Jacqueline Carey
CS Friedman - her fantasy is more widely known, but I prefer her SF - favourite is This Alien Shore
Cordwainer Smith
Elizabeth Moon - again I prefer her SF to her fantasy
SL Viehl
Sergei Lukyanenko
Simon R Green
Ursula Le Guin
Diana Wynne Jones
Jim Butcher - Dresden Files, haven't been able to get into Codex Alera
Lois McMaster Bujold - Vorkosigan
David Weber - favourite is Path of the Fury
James P Hogan - Inherit the Stars (the others got progressively worse)
Gregory Benford - Timescape
Susan Cooper - Dark is Rising
Melanie Rawn - be warned, the Ambrai (Exiles) trilogy doesn't look like ever being finished
Isobelle Carmody - Obernewtyn. Again beware, I read the first one 20 years ago and still waiting for the last book, and I think it's only up to 4 books. But the first one can be read as a standalone quite comfortably.
Mercedes Lackey - The Last Herald-Mage is the only series I found to stand up to re-reads.
It's a long list, I know. And these are just the ones I have thought of, away from my bookshelf, which I have read multiple times. Did I mention I'm a book addict? :P
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