"Clea's Moon" by Edward Wright
Update: Wright seems to have stopped selling ebooks!
"Cocaine and Blue Eyes" by Fred Zackle
The above are rather traditional "Noir" type novels
"Bangkok Burn" and
"Bangkok Wet" by Simon Royle
Wonderful "noir" style books from the perspective of the criminals.
I think I learned about all of these through the various forums on mobileread.com
And for something a little different "The Last PI" series by Richard Bowker
Dover Beach
The Distance Beacons
Where All the Ladders Start
A wonderful set of novels set in a post apocalyptic Boston, MA. The hero, is addicted to hard boiled detective novels and sets up a Detective Agency, and in spite the crumbling world around him, he learns that human nature including Greed, Lust, Fear, and Hate seems to always be with us. This isn't a spoof or a comedy, it is done in a serious mystery novel manner.