I was a big fan of Megan Whalen Turner's The Thief, though not so much the other books in the series. (There may be a fourth book I never even read.)
However, these books have a faithful following. Said faithful followers may be (and probably will be) delighted to hear that Chachic's Book Nook did a Queen's Thief Week at the end of January. There is a great deal of reading there.
While the series lost steam for me, I do think I'll be buying a copy of The Thief for my niece. Thanks to Liz. B. for the link.