J.F. Lewis, who wrote the Void City series. The first book, Staked, has one of the best first lines ever.
Somewhere in the middle of my rant
it occurred to me that I'd killed
whoever it was I'd been yelling at,
so arguing was no longer important.
Emma Bull. I pretty much love everything Emma's ever written. I reread them frequently, but the ones I read the most are Finder, Bone Dance, and War for the Oaks (Green Man review).
Hell, War... is one of the ones I've memorized whole pieces of, the way I have with The Secret Country books. And Zelazny's Lord of Light... and...
Finder, it should be noted, is part of the Bordertown shared-world mythos. Which you should also check out.
Patricia A. McKillip (a fan-run site here). First discovered through her The Riddle-Master of Hed series. [Mom bought me the second book, thinking I'd like it; she was entirely correct]. I can reel off favorite books of hers the same way I can with Diana Wynne Jones: effortlessly.
Start practically anywhere, except for Winter Rose.
Kelly McCullough, who wrote the WebMage series -- link will take you to story synopses, so be warned! I adore this series. If you loved the Amber books by Zelazny, odds are strong you'll love these too. Sass and snark levels: high.
And Steven Brust. :) Because I do love his writing. By choice, I didn't get a replacement copy of Agyar until I had the original cover (thanks to my mom's searching).
I love the Paarfi books ["The end made me cry, Steve!" "That's what Pamela said..."] and Cowboy Feng, and Vlad, and To Reign in Hell... well, you get the idea.
Considering that I finally read Steve's novels after I began working for him... I'd only read one. But I'd read half his short fiction before, and I knew he was a favorite author because nearly all the Scribblies are favorites of mine.
All of these series are named for the first book in said series. Unless I've said otherwise. And all of these authors are currently living as of this writing. Unlike the mystery authors I read.