Lois McMaster Bujold - yes
C. E. Murphy's besides Urban Shaman there is Thunderbird Falls
Neal Stephenson -- The Diamond Age, as well as Snow Crash and then The Baroque Cycle - series starts with Quicksilver and the Newton during the recoinage
---Zelanzy'-- the Amber series got boring after a while- but I really like A Night in Lonesome October- very funny
Spider Robinson -- he most recently finished a novel from a Heinlein outline-Variable Star, I particularly enjoy his Callahan's series
Tim Powers-- Last Call, Dinner at Deviant's Palace, The Drawing of the Dark, The Stress of Her Regard, On Stranger Tides, 3 days to Never
T.H. White - The Once and Future King
Garth Nix- has a couple series- Old Kingdom series -Sabriel, Lirael ,Abhorsen, Across the Wall and Keys to the Kingdom series -Monster Monday, Grim Tuesday...
Eoin Colfer -- Artemis Fowl series
Jonathan Stroud -- Bartimaeus trilogy
Cornelia Funke-- Inkheart series
Terri Windling--