At some point in your life, maybe not this very moment, but some time in the future, you will hear reference to Raymond Chandler's "how to write a good mystery story" guide disguised as a critical essay "The Simple Art of Murder."
You will wonder: "Have I read that?" Which means you probably haven't. Luckily, the University of Texas at Austin's American Literature Archive has made it easy to read Chandler's incisive work anywhere you have access to the Web. From 1950's ink-on-paper, to your 21st century electronic device: ta da!
And, should you care, they also have a virtual copy of Flannery O'Connor's 1960 essay "Some Aspects of the Grotesque in Southern Fiction."