I'll nominate
The Spirit Ring by Lois McMaster Bujold.
This is a stand-alone fantasy novel, complete in itself, and not part of some great series. It's available in drm-free multiformat at Fictionwise.
The book is set in Montefoglia, a fictional Italian city-state of the late 1500s. Magic exists as a routine technical craft.
Review here:
http://www.bscreview.com/2005/10/boo...e-spirit-ring/
"From the beginning the characters are believable. The central characters, in particular, are interesting and well thought out, drawing the reader into the machinations of plot and the inner turmoil of each individual. The imagery is accomplished with a subtle hand, the humor even more so."
"
The Spirit Ring is an absorbing and enjoyable read."
It's probably the least well-known of her books, but well worth reading. I'd certainly be delighted to have an excuse to re-read it.