Nearly everything written by Tamora Pierce. It's a good thing I started with Beka Cooper: Terrier (her most recent novel) as she's become a much better writer over time. I think if I'd started with her first book I might not have made it past the first quartet.
The Hundred Thousand Kingdoms utterly blew me away. I anticipate it being nominated for many awards next year. Think of it as David Eddings and Roger Zelazny cross-fertilized with Ursula K. LeGuin and you might get close.
I somehow missed the last onslaught of books by the lamentably late Kage Baker. My local library kindly offered up Not Less Than Gods and I ordered two more, which should be arriving by the end of this week. The aforementioned was entertaining but not her best novel. (Right now, I'd say my favorite is The Anvil of the World although other days I might claim it was Mendoza in Hollywood.)
Ally Carter always entertains, and Heist Society was no exception.
I recently discovered the mysteries of Barry Maitland and have been working through them as they free up at the library. The series starts with The Marx Sisters which still might be my favorite of the four I've read.
Similarly with Rennie Airth, although as he's only written three novels I'm already done with his entire backlist. The second novel, The Blood-Dimmed Tide, is definitely my favorite of the trio.
I don't read Nora Roberts (well, I've tried a few, which is to say under 1% of her total list) but I do adore the novels of her JD Robb pseudonym. The latest one at the library was Fantasy in Death and it did not disappoint.
I know I read at least one more author in the past couple months but I can't recall who that was. I might come back and edit this entry tomorrow!