In yesterday's comments, Sandra said that she had inadvertently bought one of the Donna Leon mysteries twice because it was republished with a different title. The same thing happened to me - I bought what I thought was a new one in Venice and then realized I already had it back home. It took me a while to track all these books down because some were out of print for a while, in the US anyway, but I did manage to find and read them all (though not in order).
I work with a bunch of readers (and mystery readers in particular), and we are always passing books around the office. Everyone loves this series, even the people who've never been to Venice. And if you're a Venice lover, these are essenziale.
So here's the list with duplicate titles in parentheses.
Donna Leon "Commissario Guido Brunetti" series
(chronological order 1992-2012)
Death at La Fenice
Death in a Strange Country
Dressed for Death (The Anonymous Venetian)
Death and Judgment (A Venetian Reckoning)
Quietly in Their Sleep (A Death of Faith)
A Noble Radiance
Friends in High Places
A Sea of Troubles
Blood From a Stone
Through a Glass, Darkly
Suffer the Little Children
The Girl of His Dreams
About Face (April 2009)
A Question of Belief (April 2010)
Drawing Conclusions (Spring 2011)
Beastly Things (to be published April 17, 2012)
Found this website which says that the next book (#20) will be released in Spring 2011.
Also mentions another book: "Brunetti's Venice: Walks Through the Novels" which sounds very cool (written by a friend of Donna Leon's).
"...a series of walks through Venice and featuring atmospheric extracts from relevant parts of the novels..."