For fantasy:
Roger Zelazny's Amber series; the first book is "Nine Princes in Amber," but you can now buy the whole series in an omnibus edition. This is truly my all-time favorite fantasy series, by a masterful storyteller.
C. J. Cherryh's Fortress series; the first book is "Fortress of Owls." She's one of my favorite authors; I've got everything she's ever written and cannot recommend her highly enough.
Elizabeth Hayden's Symphony of Ages series; the first book is "Rhapsody."
Robin Hobb's Assassin series; the first book is "Assassin's Apprentice," and her subsequent Ships series, first book of which is "Ship of Magic."
Simon Green's Nightside series. I can't remember which one is the first one, but they're all short, quick reads, livened up with madcap action and Green's quirky British humor.
Jim Butcher's Dresden FIles novels.
For historical fiction:
Patrick O'Brian's Aubrey/Maturin novels, set during the Napoleanic Wars. (Naval fiction)
W. E. B. Griffin's Brotherhood of War series; "The Lieutenants" is the first book; and his Corps series, too, set from WWII to Vietnam. (Military Fiction)
Alexander Kent's Richard Bolitho series, set during the Napoleanic Wars. (Naval fiction; you may not be able to find this series; for a long time he was available only in the British Commonwealth.)
Tom Clancy's Jack Ryan series.
Bernard Cornwall's Sharpe series (Napoeleonic Wars) and his Archer series (Seven Years War). (Military fiction)
Wilbur Smith's Ballentyne Family series, which takes place in South Africa, from its colonial beginnings up to the collapse of Apartheid.
Elizabeth Peters' Amelia Peabody series, set in Egypt from the later 19th century through WWI. It's a series primarily written for women, with a hefty dose of ather tongue-in-cheek romance, but Peters is such a wonderful writer and her characters are so lively, they're a fun read for anybody who likes a good "archeological murder mystery." The first book in "Crocadile on the Sandbank."
This post has been edited by CausticGnostic: 30 April 2009 - 09:07 AM