Even before this great crime novel cover quiz happened, I'd already become a big fan of the Guardian's little quizzes (see: James Joyce's Dublin, match the cop to the film, Franz Kafka, sci-fi book covers, gangsters in fiction, Cohen brothers or Blues Brothers?, '70s album covers... hell, just look at them all, as I am sure there are many I missed that you'd enjoy).
Embarrassingly, I got a rather paltry 6 out of 10 of the crime covers. (In my defense, having looked at the answers after taking the quiz, some of the covers are from editions I hadn't seen before.)
If you're more a fan of film noir than crime fiction, the Guardian has you covered. And if you're still hungry for more, they also have a quiz to see if you can identify classic books by their covers.